| Aalst: Domus S. Ursmari |
Wilhelmietenklooster Domus St Ursmari extra Alostum. In 1268 Countes Margaretha of Flandria donated St-Ursmarusmeers to the Wilhelmites; its first inhabitants came from Watervliet. In 1380 or 1428 they moved to the O.-L.-Vrouwe-Gasthuis.
 | F-Pa 199: a 15th century Ordinarium Guillelmitarum Alostensium |
| | A-Wn sn 12856, Liber Ordinarius Guilielmitarum; Persoons nr 1, p. 63 |
 | Verschaeren: De orde van de Wilhelmieten in België, pp. 25-34 |