The dynastic empire that the Habsburg family gathered across six centuries, as much by marriage and inheritance as by war, until it ruled the heart of Europe — a multiethnic patchwork of a dozen peoples held together by the dynasty, the Catholic Church, the army, and the bureaucracy, which finally broke apart in 1918 on the force of nationalism and left a fractured Central Europe behind.
There is an old line, often quoted, that captures how this empire was made: "Let others wage war; you, happy Austria, marry." The Habsburgs took it almost literally. From a small castle in what is now Switzerland, one family married its way to a continent — collecting crowns through wedding contracts more than battlefields, until a single Habsburg, Charles V, ruled a realm so vast that men said the sun never set on it. They held the title of Holy Roman Emperor for centuries and governed many peoples with no single everyday language. Then, in 1918, the whole structure came apart, undone by defeat in a world war, exhaustion, nationalist mobilization, and Allied support for new nation-states.