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This remnant of a fortification structure dates back to the fourteenth–fifteenth centuries. It was one of 16 roundels in the outer ring of fortifications of medieval Lviv, which was dismantled at the end of the eighteenth century. The roundel was part of the eastern curtain wall of the city's defensive fortifications. It was uncovered during the construction of the monument to Ivan Fedorov, erected on the adjacent plot. In 1977, it was conserved along with fragments of the inner curtain wall and the Masons' Tower.

A medieval fortification architecture landmark in Lviv.

An earlier wooden castle was replaced in 1362 by a stone one, of which a fragment of its southern wall has been preserved till today. In 1869 stones from the castle were used for the construction of Kopiec Unii Lubelskiej (Mound of the Union of Lublin) on top of the Lviv Castle Hill. 

The City Arsenal is a monument of fourteenth–sixteenth-century fortification architecture. Its restoration and adaptive reuse as a weapons museum were carried out between 1973 and 1980 by the Lviv Interregional Special Scientific-Restoration Production Workshop (SNRVM). The building is an architectural monument of national significance, protection No. 334.