Northumberland (USA)
[ Ball's] gr c 1805c (Bellair 2nd - Mare, by Wildair). Sire Line Godolphin Arabian. Family 4. Owned in 1815 by Joseph Ball of Virginia he sired the dam of Yarico (ch f 1831 Sumpter).

Nuncio (GB)
br c 1839 (Plenipotentiary - Ally, by Partisan). Sire Line Beningbrough. Family 12. He won 2 races as a two year old, three races and a dead heat as a three year old, and started in two selling races as a four year old. Sent to Belgium in 1843 and then on to France in 1847 he sired the Poule d'Essai winner First Born (br c 1848), the Prix du Cadran winner Trust (b f 1849), the Prix du Jockey Club winner Black Prince (bl c 1856) and Comtesse (b f 1855) the dam of the Ascot Gold Cup winner Mortemer (ch c 1865 Compiegne).

Nunnykirk (GB)
bl c 1846 (Touchstone - Beeswing, by Doctor Syntax). Sire Line Camel. Family 8. Bred by William Orde he was a full brother to Newminster (b c 1848). He won the Two Thousand Guineas Stakes in 1849. Sent to France in 1850 he sired the Prix du Jockey Club winner Potocki (br c 1854).

Nutwith (GB)
b c 1840 (Tomboy - Mare, by Comus). Sire Line Matchem. Family 9-a.

Obscurity (GB)*
ch c 1777 (Eclipse - Sister to Croney, by Warren's Careless). Sire Line Eclipse. Family 32. Bred and raced by Lord Milford he was described as a dark chestnut standing fifteen hands three inches. He won two fifties and a match for 200 guineas in England in the colours of Lord Milford in 1781 and 1782. Sent to Benjamin and John Crockett in Maryland in 1784 he covered there from 1785 to 1786 after which he apparently covered in the Hunt stud in New Jersey from 1787 to 1788. In 1789 he was in the Chalmeria stud of James French, Dinwiddie County, Virginia, following which he was advertised for sale in Charleston, South Carolina, while covering at the Lithgow stud near Columbia. In 1791 he stood at the Horse Savannah stud of R Miles, in 1792 at Gillon`s Retreat, and in 1793 and 1794 at Wade Hampton's stud on Gill's Creek, South Carolina. He returned to New Jersey in 1795 and stood there until 1800, which is the last record of him. Along with some good mares he got Bacchus (b c 1787) and Cage's Bompard (bl c 1796).

Octavian (GB)
ch c 1807 (Stripling - Mare, by Oberon). Sire Line King Herod. Family 8. Bred by the 6th Duke of Leedes he was described as a good horse and a fine stayer. As a three year old he won two races including the St Leger from three starts, two races from three starts as a four year old and both his starts as a five year old. He sired the St Leger winner Antonio (b c 1816), Octaviana (b f 1815) the dam of the July Stakes winner Crusader (br c 1823 Cervantes) and Garcia (br f 1823) the dam of the Two Thousand Guineas winner Archibald (b c 1829 Paulowitz) and the July Stakes winner Queen Anne (b f 1843 Slane).

Octavius (GB)
br c 1809 (Orville - Marianne, by Mufti). Sire Line Beningbrough. Family 23-a. Bred by Robert Ladbroke he won the Derby Stakes and the Epsom Gold Cup. He sired the stallion Little John (gr c 1816), the Ascot Gold Cup winner Sir Huldibrand (br c 1818) and the Goodwood Cup winner Cricketer (b c 1822). He died early in 1831.

Oglethorpe Arabian (GB)
c 1680c (Darcy's Yellow Turk). Sire Line Darcy's Yellow Turk.

Oiseau (GB)
ch c 1809 (Camillus - Sister to Rosa, by Ruler). Sire Line King Fergus. Family 42. Running only as two year old he won all five of his races. He covered in Ireland prior to returning to England. He sired the St Leger winner Rowton* (ch c 1826), Velvet (b f 1823) the dam of the St James's Palace Stakes winner Scutari (b c 1837 Sultan) and Cuirass (ch f 1823) the fifth dam of the Derby winner Hermit (ch c 1864 Newminster). Oiseau died in 1826.

Old Bald Peg (GB)
f 1665c. Family 6.

Old England (GB)
b c 1741 (Godolphin Arabian - Amorett, by Bartlet's Childers). Sire Line Godolphin Arabian. Family 15. A brother to Blank he was bred by Lord Godolphin and purchased by Sir John Dutton in 1741. In 1746 he won 70 guineas at Burford, beating easily Lord Leigh's Saucebox and Lord Chedwoth's Cartouch. Starting for Mr Greville in April of 1747 he won 50 guineas at Newmarket beating Mr Grisewood's Pompey. At the same place he won 70 guineas, beating Sir M Wyvill's Chip, Lord Portmore's Cumberland, Mr Hunt's Jigg and five others. The same year he won the King's Plate at Guildford beating Mr Panton's Veteran and Sir M Wyvill's Chip. In April of 1748 he won the King's Plate at Newmarket beating Sir William Middleton's Squirrel. Purchased by Sir Watkin Williams-Wynn he won a fifty, beating easily Lord Portmore's Bald Partner whilst conceding him well over two stone. In 1749 he walked-over at Farn for the 21 gs Annual Plate after which he collected a £15 premium at Chester. Following this he walked-over for a fifty at Warwick. He then won a fifty at Lichfield beating easily Mr Pratt's Bully. Sir Edward O`Brien purchased him and ran him several times in Ireland after which he was retired to the stud. He remained in Ireland until about 1764, first at Eyre-Court, Galway, and after at Assollas, Clare. In 1765 he was back in England in the Leedes stud at North Milford, Yorkshire. Fairly popular as a stallion he sired, among many others, Northumberland* (gr c 1761).

Old England (GB)*
[Starling, Hero, Bellinger] b c 1757 (Holme's Young Starling - Mare, by Slipby). Sire Line Darcy's White Turk. Family 4. He was sent to Virginia in 1762. He raced from 1763 through 1767 as Leary's Old England in New York and Pennsylvania, and spent the remainder of his known life in New York.

Old England (GB)
[Sir William] b c 1793 (Sir Peter Teazle - Maid of Ely, by Tandem). Sire Line Highflyer. Family 45. Bred by Mr Legh he sired Brown Bread (br c 1799).

Old England (GB)
b c 1842 (Mulatto - Fortress, by Defence). Sire Line Eclipse. Family 3-a. Said to stand 15 hands 3 inches "with black legs" he won all of his two year old races including the July Stakes, the New Stakes, the Drawing Room Stakes and two Queen's Plates. He sired the Cesarewitch winner Haco (b c 1850) and Avonmore (ch f 1852) the fifth dam of the stallion St. Wolf (b c 1905 St. Frusquin).

Old Montagu (GB)
[Darcy's] c 1690c. Sire Line Old Montagu. His name is sometimes spelled Old Montague. He sired the third dam of Eclipse (ch c 1764 Marske).

Old Royal (GB)
c 1715c (Holderness Turk - Kitt Darcy's Royal Mare, by Blunderbuss). Sire Line Holderness Turk. Family 13. His dam was the Royal Mare owned by Kitt Darcy and bred by his sister, who was acclaimed "highest bred Mare in England" [Heber 1759:148]. He is particularly noted for his daughter, the celebrated Bald Charlotte (ch f 1721), ancestress of Family 40 in America which included such luminaries as Boston (ch c 1833 Timoleon), sire of the mighty Lexington (b c 1850). Another unnamed daughter produced the winner Jack Come Tickle Me (ch c 1737 Thoulouse Barb Colt).

Old Scar (GB)
b c 1705 (Makeless - Bay Layton, by Darcy's Counsellor). Sire Line Darcy's Yellow Turk. Family 4.

Omar (GB)
b c 1752 (Godolphin Arabian - Sister to Hector, by Lath). Sire Line Godolphin Arabian. Family 9-a. Bred by the Duke of Devonshire he sired Miss Spindleshanks (b f 1770) the second dam of the York Royal Plate winner St. George (b c 1789 Highflyer).

Omnium (GB)
b c 1758 (Snap - Miss Cade, by Cade). Sire Line Darley Arabian. Family 4. Bred by Jenison Shafto he ran several times without success. He retired to stud in Yorkshire with Mr Leedes at North Milford. He also covered at Ellerton, near Catterick and then returned to North Milford. He was said to have gotten very few mares other than those of Mr Leedes. He sired Amaranda (f 1771) the dam of Joe Andrews (b c 1778 Eclipse).

One Eye (USA)
bl c 1775c (Janus* - Mare, by Janus* - Mare, by David* - Mare, by Jolly Roger*). Sire Line Godolphin Arabian. Owned by William Williams Senior of Martin County, North Carolina he sired the second dam of Huntsman (b c 1788).

Onus (GB)*
br c 1834 (Camel - The Etching, by Rubens). Sire Line Camel. Family 3-a. Bred by Mr Wright he was imported by Colonel Charles Oakley of Illinois.

Orby (GB)
ch c 1904 (Orme - Rhoda B., by Hanover). Sire Line Bend Or. Family 26.

Orlando (GB)
b c 1841 (Touchstone - Vulture, by Langar). Sire Line Camel. Family 13-a.

Orme (GB)
b c 1889 (Ormonde - Angelica, by Galopin). Sire Line Bend Or. Family 11-c.

Ormonde (GB)
b c 1883 (Bend Or - Lily Agnes, by Macaroni). Sire Line Bend Or. Family 16-h.

Oroonoko (GB)
bl c 1745 (Crab - Miss Slmmerkin, by Young True Blue). Sire Line Alcock's Arabian. Family 7.

Orphan (USA)
ch c 1810 (Ball's Florizel - Fair Rachel, by Diomed* - Susan Jones, by Shark* - Mare, by Thornton's Wildair. Sire Line King Herod. Owned by Roger Atkinson he sired Nell (ch f 1825c) the fourth dam of the Manchester Cup winner Wallenstein (ch c 1877 Waverly) and Lucy (b f 1821) the fourth dam of the stallion Lever (b c 1863 Lexington).

Orville (GB)
b c 1799 (Beningbrough - Evelina, by Highflyer). Sire Line Beningbrough. Family 8-a.

Oscar (GB)*
ch c 1760 (Ancaster's Young Snip - Mare, by Morton's Arabian). Sire Line Darley Arabian. Family 37. Imported around 1767 he stood in Cumberland County, Virginia in 1777. He sired Alston's Kitty Fisher (f 1776c).

Oscar (GB)*
[Lightfoot's] br c 1795 (Saltram* - Mare, by Highflyer). Sire Line Eclipse. Family 3.

Oscar (USA)
[Ogle's] b c 1800 (Gabriel* - Vixen, by Medley* - Penelope, by Tayloe's Yorick - Mare, by Ranter* - Mare, by Gift*). Sire Line St Victor's Barb. A champion racehorse in Maryland he sired the stallion Silverheels (gr c 1815) and Katy Ann (ch f 1825c) the third dam of Hunter's Glencoe (b c 1857 Glencoe*).

Oscar (GB)
br c 1820 (Juniper - Mare, by Oscar). Sire Line Eclipse. Family 10. He sired the second dam of the Chester Cup winner Red Deer (b c 1841 Venison) and Malvina (ch f 1830) the third dam of the Oak winner Gamos (ch f 1867 Saunterer).

Othello (GB)
[Portmore's] bl c 1743 (Crab - Miss Slammerkin, by Young True Blue). Sire Line Alcock's Arabian. Family 7.

Othello (GB)*
[Kingston's] bl c 1746 (Crab - Somerset's Favourite, by Hampton Court Childers - Mare, by Hobgoblin - Mare, by Lister's Snake). Sire Line Alcock's Arabian. Bred by Lord Kingston he was imported into Maryland by Benjamin Tasker in 1755. He was owned in 1761 and 1762 by Nathaniel Harrison in Virginia and then returned to Governor Horatio Sharpe in Maryland. Very well patronised in the stud he got, among others, Gantt's True Briton (b c 1757) and Galloway's Selim (br c 1759). He died in 1772.

Otho (GB)
b c 1760 (Chedworth's Moses - Miss Vernon, by Cade). Sire Line St. Victor Barb. Family 4-b.

Overton (GB)
b c 1788 (King Fergus - Mare, by King Herod). Sire Line King Fergus. Family 11. Bred by Mr Hutchinson he won the Doncaster Cup in 1792. He sired the St Leger winner Cockfighter (br c 1796). He died in 1801.

Oxford (GB)
ch c 1857 (Birdcatcher - Honey Dear, by Plenipotentiary). Sire Line Birdcatcher. Family 12-g. He finished second twice as a two year old, ran unplaced twice as a three year old and won two minor outings with a second place finish in the Liverpool Spring Cup as a four year old. He sired Sterling (b c 1868).

Oxford Dun Arabian
bu c 1710c. Sire Line Oxford Dun Arabian.