The parish church dedicated to the Holy Trinity was built around 1420-1430. In 1613, at the time of the St. Adalbert fair in Gniezno, had a fire in which the entire city suffered. The cruel fate also affected the church of Holy Trinity which burned down. Its reconstruction lasted almost 20 years and introduced baroque changes in the medieval look of the monument. Over the next decades, the church underwent gradual destruction, until the end of the nineteenth, early twentieth century when the temple was renovated.
It is a one-nave, aisleless temple, orientated, with a chapel of a literary brotherhood from the 17th century adjoining to it from the south, and a tower and a smaller chapel dedicated to Saint Anthony from the north side. The presbytery is polygonaly ended. The gothic sacristy door, of iron sheet from the first half of the 15th century, is noteworthy.