Rear-Admiral Sir Thomas Ussher KCH CB was an Anglo-Irish officer of the British Royal Navy who served with distinction during the French Revolutionary and Napoleonic Wars, and who in 1814 conveyed Napoleon Bonaparte into exile in Elba. He was nicknamed Undaunted Ussher.

Elba is a Mediterranean island in Tuscany, Italy, 10 km (6.2 mi) from the coastal town of Piombino on the Italian mainland, and the largest island of the Tuscan Archipelago. It is also part of the Arcipelago Toscano National Park, and the third largest island in Italy, after Sicily and Sardinia. It is located in the Tyrrhenian Sea about 50 km (30 mi) east of the French island of Corsica.