Belasius Timeline and Summary

Belasius becomes Merlin's tutor in Brittany.
Belasius performs a human sacrifice on the isle of the druids and catches Merlin watching him.
Belasius kinda sorta curses Merlin—he'll have to pay for witnessing their secret meeting.
Belasius takes Merlin along to some druid meetings and continues to teach him regular stuff during the day.
We learn from Ulfin that Belasius has died but has also kept his promise to free his servant upon his death.