|"If you don't buy a muslin Gown now on the strength of this Money, & Frank's|
promotion, I shall never forgive You."
-Jane to Cassandra, December 28, 1798
Frank served in the Navy from 1786-1865. He rose quickly through the ranks, it is believed this was due to a connection with Warren Hastings. He rose to the rank of Admiral of the Fleet (the highest rank in the British Royal Navy). Frank served during the French Revolutionary Wars, the Napoleonic Wars, and the Crimean War. He received the Knights Grand Cross of the Order of the Bath.
Francis Austen - Wikipedia
Jane Austen's Sailor Brothers: Francis and Charles in Live and Art by Brain Southam
Sir Francis William Austen: Glimpse of Jane's Sailor Brother in Letters - Jane Austen's World
General Google Search Results - there was a lot on him!