Jedi Master Sirrus possessed a holocron, which remained with him throughout the Clone Wars. This holocron is referred to as Master Sirrus's holocron.
During the Clone Wars, Sirrus and his Padawan, named Aubrie Wyn, fought in the Battle of Jabiim. Sirrus gave the holocron to Wyn, with instructions to deliver it to the Jedi Temple located on Coruscant when she went there for advanced training with Master Windu. Sirrus died in battle, so Wyn kept the holocron, fighting with the orphaned Padawans of the Padawan Pack and the Jabiimi Loyalists. Wyn knew she would die in an upcoming fight to stall the Jabiimi Nationalists, so she gave the holocron to Anakin Skywalker, who was in charge of getting Republic forces off Jabiim. This allowed Wyn to fulfill her promise to her master.