The Dutch did not build Fort Willem II in isolation. It was one link in a chain of fortifications strung along the trade routes of Central Java -- Fort Herstelling in Salatiga, Fort Veldwachter in Boyolali, and this square-shaped outpost in Ungaran, each positioned to control movement between the coast and the interior. The exact date of construction remains disputed. The commonly cited year is 1786, but some sources push it back to 1712, and others place it between 1740 and 1742, during a chaotic period when Governor-General van Imhoff was hospitalized inside the fort after Surakarta forces attacked. What is certain is the design: four half-bastions at the corners, a moat surrounding the perimeter -- since filled in during the nineteenth century -- and a two-story central building offering sightlines to both the western main entrance and the eastern rear gate. The buildings ring an inner courtyard, turning inward like a clenched fist.

Few buildings on Java have changed hands as often. The Dutch built it, but between 1800 and 1807 the Batavian Republic controlled the fort. Then Napoleon's influence rippled east: French soldiers garrisoned it from 1807 to 1811. The British took over from 1811 to 1816, when it returned to the Dutch. Then came 1826 and the Java War. Kyai Mojo, the religious advisor and military commander serving Prince Diponegoro, attacked from the direction of Rembang with enough force to surround the fort for two weeks. The garrison nearly fell. But Kyai Mojo withdrew, and the fort held. When Diponegoro himself was captured in 1830, it was to Fort Willem II that his captors brought him. He spent three days within these walls in August of that year before being transferred to Batavia for trial and eventual exile to Makassar. The prince who had nearly brought the fort down was now its prisoner.

After Diponegoro's brief imprisonment, the fort continued its restless metamorphosis. The British returned in 1849, this time without a fight, and converted it into a hospital before handing it back. The Dutch used it as a military camp during 1918 and 1919. When Japan occupied the East Indies from 1942 to 1945, the fort became a prison -- a function that needed little architectural modification, given that it had been designed to keep people contained. The Dutch reoccupied it in 1945 and turned it into police barracks. After Indonesian independence, the Indonesian National Armed Forces briefly claimed the space before transferring it to the police in 1951. Each new occupier layered its own purpose onto the same stone walls, like geological strata recording the political pressures of their era.

In 2007, the Semarang Regency announced plans to convert Fort Willem II into a museum. By 2011, renovation work had begun. The idea made a certain kind of sense: here was a building that embodied the entire arc of Javanese colonial history, from Dutch trade control through Napoleonic reach, British occupation, Javanese resistance, Japanese imprisonment, and Indonesian independence. But land ownership disputes halted the project, and the restoration was cancelled. Today, sixteen police families live inside the fort. Their laundry dries in the courtyard where soldiers once drilled. Their children's bicycles lean against walls that absorbed musket fire. The Regional People's Representative Assembly conducts its business just outside the front gate, democratic deliberation happening steps from where a colonial power once projected its authority. Fort de Ontmoeting was named for a meeting between a king and a governor. Nearly three centuries later, the meetings that matter happen in the building across the street, while the fort itself has become something its builders never intended: a home.