Isaac Trimble Preston (1793–July 4, 1852) was a 19th-century Louisiana lawyer, politician, and Justice of the Louisiana Supreme Court. Preston was born in Rockbridge County, Virginia, the son of Francis Preston. In a letter to James Madison, Francis Preston suggests Isaac's birth to have been illegitimate, describing the younger Preston to have been "the fruit of Youthfull (sic) folly." He studied at Greenville College in Greene County, Tennessee and graduated from Yale College in 1812 as class valedictorian. He began studies as Litchfield Law School in Litchfield, Connecticut the same year, but put his education on hold to join the Army as a captain in the 35th Infantry during the War of 1812 on March 31, 1813. He received an honorable discharge in June of 1815 and resumed his legal studi