The Holy Trinity Chapel, situated on the Castle Hill, is one of the most important historic buildings in Lublin. It features beautiful Russo-Byzantine frescoes painted in the first half of the 15th c. at the request of King Ladislaus Jagiello. These paintings on the walls of a Roman-Catholic chapel depict religious images characteristic of the Orthodox Church, which is a unique example of the co-existence of East and West European cultures in Lublin. Among the portraits of saints and biblical scenes there are frescoes presenting Ladislaus Jagiello – and they are the only depictions of the king painted during his lifetime.