Aglona is a village in Preiļi Municipality, Latvia. It is located 40 kilometers (25 mi) northeast of the city of Daugavpils.

Latgalian is an Eastern Baltic language, although it is sometimes considered a dialect of Latvian. The Latvian language law classifies it as a "historical form of Latvian". It is mostly spoken in Latgale, the eastern part of Latvia. The 2011 Latvian census established that 8.8% of Latvia's inhabitants, or 164,500 people, speak Latgalian daily. 97,600 of them live in Latgale, 29,400 in Riga and 14,400 in the Riga Planning Region.