House Didymos of Third Brother
| Seat | |
| Head | |
| Region | |
| Title | Lord of Third Brother |
| Overlord |
House Didymos of Third Brother is a house sworn to House Agenos. According to family legend, the house was founded after a succession dispute between two twin brothers. The two brothers dueled each other to mutual death, upon which the claim went to their younger third brother, who subsequently raised the castle of Third Brother where they fought.