The Memorial Tomb of Alexander I of Battenberg (Bulgarian: Гробница паметник „Александър І Батенберг", Grobnitsa pametnik „Aleksandar І Batenberg"), better known as the Battenberg Mausoleum (Мавзолей на Батенберг, Mavzoley na Batenberg) in Sofia, the capital of Bulgaria, is the mausoleum and final resting place of Prince Alexander I of Bulgaria (1857–1893), the first Head of State of modern Bulgaria.