Trojice, Italian: Chiesa della Santissima Trinità) is a historical building in Hrastovlje, a village in southwestern Slovenia.

The church stands behind a wall that the local population built to protect itself from Turkish attacks in the 16th century.

In 1896, a hole was knocked in the northern wall to create a new window, but unfortunately some of the frescoes in the church were destroyed at the same time.

The church has been painted with Gothic frescoes by Johannes de Castua, who finished his work on 13 July 1490.

[3] They were discovered in 1949 under thick layers of plaster by the academic sculptor Jože Pohlen [sl].

It would be hard to determine exactly when the wall was built, but it is estimated that it was constructed some time around the end of the 15th century, therefore definitely later than the church itself.

There was also a balcony above the entrance gates, from which it was possible to defend the church by throwing stones or pouring boiling water on attackers.