Fort Erie is a town on the Niagara River in Niagara Region, Ontario, Canada. It is directly across the river from Buffalo, New York, and is the site of Old Fort Erie which played a prominent role in the War of 1812.

The Fenian Brotherhood was an Irish republican organisation founded in the United States in 1858 by John O'Mahony and Michael Doheny. It was a precursor to Clan na Gael, a sister organisation to the Irish Republican Brotherhood (IRB). Members were commonly known as "Fenians". O'Mahony, who was a Gaelic scholar, named his organisation after the Fianna, the legendary band of Irish warriors led by Fionn mac Cumhaill.