William Kerr, 4th Marquess of Lothian

General William Henry Kerr, 4th Marquess of Lothian KT (1710 – 12 April 1775) was a Scottish nobleman, British soldier and politician, the eldest son of William Kerr, 3rd Marquess of Lothian. He was styled Master of Jedburgh until 1722, Lord Jedburgh from 1722 to 1735, and Earl of Ancram from 1735 to 1767. As the Earl of Ancram, he distinguished himself during the War of the Austrian Succession.

On 6 November 1735, he married Lady Caroline Darcy (d. 1778), daughter of Robert Darcy, 3rd Earl of Holderness, and thereafter assumed the style of Earl of Ancram rather than Lord Jedburgh. They had three children:

Ancram was commissioned a cornet in 1735. He was a captain in the 31st Regiment of Foot in 1739, and transferred as such to the 1st Regiment of Foot Guards in 1741. He fought with the Guards at the Battle of Fontenoy (1745) while serving as an aide-de-camp to the Duke of Cumberland, and was wounded during the battle. He was subsequently made an ADC to the King and a colonel. In the same year, he was appointed lieutenant-colonel of Lord Mark Kerr's Regiment of Dragoons, and commanded the cavalry on the left wing at the Battle of Culloden in 1746. (His older brother, Lord Robert Kerr, was with the infantry and was the highest-ranking Government casualty of the battle.) After the battle, he commanded the forces at Aberdeen until August, and then returned to the Continent with Cumberland in December. At some point during the year, he was appointed a Groom of the Bedchamber to Cumberland.

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