Not far from the Church of St. Wenceslas in the Strakonice cemetery stands the early baroque Holy Trinity Chapel, also known as the Tomb of Hereditary Postmasters.  It was established in 1680. An inscription chiselled into the marble plate covering the crypt provides information about the foundation. The chapel served as a place of worship and was consecrated by the then Archbishop of Prague. In the era of Josephinism it was decreed that the place be abandoned. Later it was repaired by the postmaster Jan Michael Čížek and returned to its original purpose. Jan Nemrha became the postmaster on 7 August 1751 and the office became hereditary. The tomb thus became the final resting place for the family of hereditary postmasters of Strakonice, who maintained the place.

The current owner is Maria Follprachtová from Prague, a direct descendant of the Strakonice hereditary postmasters, and a relative of the famous Czech politician František Palacký. The structure was damaged during an air raid on the railway station at the end of WWII together with the Church of St. Wenceslas. It was repaired only after the war. The tomb was used around 1970 by the municipal services as a festival hall and later temporarily as a garage for a small garden tractor. The facade was only renovated in 1995, followed by the painted illusive altar in the front. Two saints are painted on the sides of the chapel: St. Florian and St. Urban, whose teachings are ambiguous. The well-preserved renaissance grille is worthy of note.