Acilius Bolar was a member of the Blades.
Acilius was originally stationed at Cloud Ruler Temple. After the Thalmor attacked the Blades stronghold, he was the only known survivor of the attack. From there, Bolar traveled north to Skyrim, eventually ending up at Bloated Man's Grotto.
He was pursued by the Thalmor, however, and as such, to prevent the Thalmor from desecrating the shrine, went to "face his death with honour". He left behind his sword and a note explaining why he left, and that he asks that whoever finds his sword to meet death the same way he did.
- The Elder Scrolls V: Skyrim (Mentioned only)