From the English Wikipedia page [1]

Ilūkste Municipality (Latvian: Ilūkstes novads) is a municipality in Selonia, Latvia. The municipality was formed in 2003 by merging Pilskalne Parish, Šēdere parish, Bebrene parish and Ilūkste town. In 2009 it absorbed Dviete parish, Eglaine parish and Subate town with its rural area the administrative centre being Ilūkste. In 2010 the rural area of Subate was reorganised as a separate territorial entity, Prode parish.

More information on the Latvian Wikipedia page [2].