The Hevelli or Hevellians/ Navellasîni (sometimes Havolane; German: Heveller or Stodoranen; Polish: Hawelanie or Stodoranie; Czech: Havolané or Stodorané) were a tribe of the Polabian Slavs, who settled around the middle Havel river in the present-day Havelland region of Brandenburg in eastern Germany from the 8th century onwards.
The Hehfeldi as they were called by the Bavarian Geographer about 850 built their main fortification at Brenna (later to become Brandenburg an der Havel) and a large eastern outpost at the current site of Spandau.
These efforts were aborted in the course of the 983 Great Slav Rising in the Northern March, which again defied German control over the region.
Together with the neighbouring Sprevane in the east, the Hevelli waged war against not only the German Saxon forces to the west, but also other Slavic tribes.
The baptized Hevelli prince Pribislav (died 1150) finally bequested his lands to the Ascanian count Albert the Bear.