Francis Seymour, 5th Duke of Somerset (17 January 1658 – 20 April 1678), known as 3rd Baron Seymour of Trowbridge between 1665 and 1675, was an English peer.

He was the son of Charles Seymour, 2nd Baron Seymour of Trowbridge

Charles Seymour, 2nd Baron Seymour of Trowbridge

Charles Seymour, 2nd Baron Seymour of Trowbridge was the son of Francis Seymour, 1st Baron Seymour of Trowbridge, whom he succeeded in the barony in 1664....

 and Elizabeth Alington (1635–1692). He died aged 20, unmarried and childless, having been shot dead by Horatio Botti (a Genoese

Genoa

Genoa |Ligurian]] Zena ; Latin and, archaically, English Genua) is a city and an important seaport in northern Italy, the capital of the Province of Genoa and of the region of Liguria....

 gentleman), whose wife Seymour is said to have insulted at Lerici

Lerici

Lerici is a town and comune in the province of La Spezia in Liguria , part of the Italian Riviera. Its nearest bay is the Bay of Lerici. The town is connected by ferry to the Cinque Terre and Portovenere....

. He was succeeded by his brother Charles Seymour

Charles Seymour, 6th Duke of Somerset

Charles Seymour, 6th Duke of Somerset , sometimes referred to as the "Proud Duke". The son of Charles Seymour, 2nd Baron Seymour of Trowbridge, and Elizabeth Alington , he succeeded his brother Francis Seymour, 5th Duke of Somerset, to the dukedom when the latter was shot in 1678...

.