Lord Patrick James Herbert Crichton-Stuart (25 August 1794 – 7 September 1859), known as the Hon.
His mother was Lady Elizabeth Penelope, daughter and heiress of Patrick McDouall-Crichton, 6th Earl of Dumfries, while John Crichton-Stuart, 2nd Marquess of Bute, was his elder brother.
His father was killed in a riding accident six months before he was born and his mother died when he was three.
In 1817 he was granted the rank of a younger son of a marquess and assumed by Royal licence the surname of Crichton.
The following year he was returned to Parliament for Cardiff, succeeding his uncle Lord Evelyn Stuart, a seat he held until 1820 and again from 1826 to 1832.