[2] Sibrand had travelled to Outremer in 1188, in the Third Crusade of Frederick Barbarossa, as a follower of Adolf III of Holstein.

Sibrand is mentioned as the founder of a hospital in a document by king Guy of Lusignan dated to September 1190.

After the Fall of Acre in July 1191, the hospital was moved into the city and evolved into the permanent base of the Teutonic Kings.

[2] With the help of donations made by the faithful, a garden for the hospital was financed and created in front of the gate of St Nicholas.

[3] He stays in the port of Acre,[4] using ships he acquired to form a blockade around the city,[3] though he is eventually slain by Altair.