Sisak Fortress

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Sisak Fortress
Tvrđava Sisak Stari grad Sisak
Sisak, Croatia
Sisak Fortress from the south
Coordinates	45°28′14″N 16°23′10″E / 45.470531°N 16.386222°E / 45.470531; 16.386222
Type	Lowland fortress
Site information
Controlled by	Bishop of Zagreb; from the 17th century: several other possessors
Open to the public	Sisak Town Museum
Condition	partially preserved
Site history
Built	1544-1550
Built by	Petar de Mediolanus
Materials	brick, hewn stone (ashlar)
Cultural Good of Croatia
Type	Protected cultural good
Reference no.	Z-3487[1]

The Sisak Fortress (Croatian: Tvrđava Sisak or Stari grad Sisak) is an early modern lowland fortification built on the bank of the Kupa River before its mouth into the Sava. It is situated in the suburb of modern-day city of Sisak, Sisak-Moslavina County, central Croatia.

It is a triangle-shaped structure, mostly made of brick and supported by stone parts. Each corner of the fortress is reinforced with a round tower covered by conical roof. Towers are connected by the more than 30 metres long thick walls with loopholes. Being on the river bank, the fortress has a natural line of defense from the west-southwest, while the other sides are partially protected by the Sava River in the immediate vicinity, flowing southeast.

In its history, the Sisak Fortress was damaged several times and subsequently subjected to renovations. Generally, although it needs a renewal today, it is in good condition. It houses the local town museum.