Almenum is a historic locality in the territory of the village of Midlum, Friesland, which is in the municipality of Harlingen in Friesland, The Netherlands. It is located at the intersection of Zuidwalweg and Haulewei. Almenum according to legend is the site of the first Christian church in Friesland built in 777 AD by Gustavus Forteman. The church was the Cathedral Almenum. In 1157 Eilwardus Ludinga founded a monastery called Ludingakerke. The monks dug canals to provide access to trading vessels. Ludingakerk became one of the richest monasteries in Friesland. The area west of Almenum, became more important and turned into the city of Harlingen.