The Order's master, Villekin of Endorpe, in 1287 builds a castle called Heiligenberg right next to the Tērvete castle to conquer the remaining Semigallian hillforts.

The Semigallians in the same year, make another attempt to conquer Rīga, but again fail to take it.

Livonian knights attack them on their return home, but are defeated at the Battle of Garoza, in which the Orders' master Villekin and at least thirty-five knights lose their lives.