The current St. Catherine's Church is the second or third church on this site. The oldest church probably dated from 1245, when the Maaseik parish was founded. The sacristy houses a particularly beautiful church treasure, including some very old works of art. Most objects come from the former abbey of Aldeneik and were taken by the canons to the St. Catherine's Church in 1570. Although the church's goods were confiscated by the French in 1796, the sexton was able to save most of the valuables from the treasury, thus sparing them the fate of many other church treasures - destruction, meltdown or forced sale. A comparison with an inventory from 1647 shows that the treasure is virtually intact. The church treasure of St. Catherine's Church includes the Codex Eyckensis from the 8th century, the oldest evangeliary in the Benelux. Various relics attributed to the saints Harlindis and Relindis. Some reliquaries in the church treasure date from the 9th or 10th century. The textile treasure is also special, which although small, contains some very rare pieces, including the so-called David silk (8th/9th century), the velamen of Harlindis, a stole-like fabric (9th century, possibly with older parts) and the oldest Anglo-Saxon fabrics in the world (8th/9th century).