Standing at the centre of Tvrđa’s Austrianate main square is the so-called Plague Column (Zavjetni stup), a curious Baroque pillar topped by a swarm of cherubic angels borne on billowing clouds. It was erected in 1729 by the widow of Habsburg General Petraschi to give thanks for the garrison’s deliverance from an outbreak of plague. (It obviously didn’t do much good: plague returned to the city at regular intervals throughout the 1740s). The cloak-shrouded statues at the base, added in 1784, depict saints Sebastian, Rock, Rosalia and Catherine.