Oldest mention of Houthem in writing.

Conquest of Jerusalem by the Crusaders in the First Crusade.

The Land of Valkenburg comes into the possession of the Lords of Heinsberg. Under Gozewijn I (1118-1128) a castle was built in Valkenburg on the Heunsberg, the present ruin of which is the remnant.

Birth of the knight Gerlach in the Maastricht area.

Second Crusade in which the intended conquest of Damascus fails.

Pilgrimage of Gerlach to Jerusalem and stay as a herdsman at St. John's Hospital there.

Coronation of Emperor Frederick Barbarossa in Aachen Cathedral.

Residence of hermit Gerlach in a hollow oak in Houthem, later there in a hermitage (a wooden chapel and a small living room).

Gozewijn III, lord of Valkenburg, accompanied Emperor Frederick Barbarossa on three Italian campaigns between 1154 and 1176.

Death of Gerlach, saint of the Geul valley.

Donation of land "by the oak" (the land around the hermitage) to St. Mary's Monastery in Heinsberg, Germany.

Shortly after about 1165: origin of pilgrimage to the tomb of St. Gerlach.

Reconquest of Jerusalem by Saladin.

Third Crusade; the Crusaders fail to conquer Jerusalem. Frederick Barbarossa drowns in this crusade while wading through a river.

Permission to the monastery of St. Mary to build a chapel on this land "near the oak" and foundation at this chapel of the monastery of St. Gerlach by Gozewijn IV, lord of Valkenburg.

First mention of "locum sancti Gerlaci," the place of St. Gerlach.

Fourth Crusade: Gozewijn IV, lord of Valkenburg, breaks his crusading oath, but is released from the subsequent ecclesiastical ban by the donation of a farmstead in Munstergeleen to the monastery of St. Gerlach.

Chapel in the vault of St. Gerlach flooded by flooding of the Geul, the provost of St. Mary's monastery had a tomb made for a shrine containing St. Gerlach's remains.

First certain mention of St. Gerlach monastery in Houthem.

A monk describes the life of St. Gerlach in the Vita beati Gerlaci.

Admission of the nunnery St. Gerlach to the Order of Norbertines.

Papal protection of the monastery St. Gerlach and confirmation of all property.

Donation to the monastery of St. Gerlach of the road through the village of Sint-Gerlach by Walram, lord of Valkenburg and Monschau.

Nomination by the St. Gerlach monastery of a new priest for Oirsbeek church.

Construction of a wall around the monastery of St. Gerlach on the property of the Maastricht chapter of St. Servaas.

Foundation of an altar in the monastery of St. Gerlach by Goblio of Schinnen, canon of St. Peter in Liege.

Agreement on a maximum of 30 nuns in the convent of St. Gerlach.