Haštalské náměstí
From Prague-wiki
Church of Saint Castulus on Haštalské náměstí
Haštalské náměstí is a square in the northeast part of the Old Town. It is best known for the church of Saint Castulus (Castulus is Haštal in Czech) standing there. It is one of Prague's oldest squares, and St Castulus is one of the oldest churches in Prague. There used to be a cemetery at the church, but it was abandoned in 1832. You can however still see the old ossuary (No. 1041/6) in the northeast corner of the square, at the beginning of Řásnovka street.
You could hardly find the name Haštalsko on a list of Prague districts, but the Old Town citizens regularly called by this name an area of parish settlement of the church of St. Haštal, north of Dlouhá Street and west of Revoluční Street.