Out of all early-medieval (old Croatian) architectural monuments in Dalmatia, which historians date back to the period between 8th and 11th century, Church of Holy Trinity, with its original shape and rich findings, has a very important place.

This small central edifice with six-leaf structure of semicircular arches strung around irregular circle has become one of the most precious heritage monuments of Split and Dalmatia.

English architect Thomas Graham Jackson, while studying the old architecture of Dalmatia, was first warned of the exceptional heritage value of this edifice, although it was founded abandoned and partially demolished in 1887.

Arches and altar screen are a typical example of pre-Romanesque stone sculpture which is harmoniously decorated with the geometric Croatian interlace motifs and carved text.

As a result, the head of a monastery of the Assumption of Mary from Poljud neighborhood in Split, fra Vjekoslav Bonifačić, asked the authorities to renovate the church, which they eventually did.