The Edirr have have a been at odds with the Coman, being houses of similar size and neighbors right across the river. The Edirr sometimes poach on the Coman's side of the river, with the Lords Edirr sometimes leading the raids themselves, just for the devilment of it in it's own right.
Both in the High Council chamber at Gothregor, and in the hall at Tentir, the Randir, Coman, and Caieron are on one wall; Jaran, Knorth, and Ardeth on one; and Danior, Edirr, and Brandan on one. This layout is said to group allies. Within this trio, Brandan is the biggest and most powerful of the three. They are also the only grouping with only one "large" house, which suggests they may be less internal power struggles within this alliance, in contrast with the Randir-Caineron and Knorth-Ardeth alliances.
↑To Ride a Rathorn, "Chapter VII: In the Bear's Den", I — "the Edirr, in a falcon's jeering shriek;"
↑The Sea of Time, "Chapter XIII: Dreams and Nightmares", VI — "The Kencyr shouted back their defiance, each in the battle cry of his house—[…] the Edirrs’ jeering shriek,"
↑ 3.03.1Honor's Paradox, "Chapter V: The High Council", III — "To one side, two identical boys dressed in sunlit wheat gold were teasing a sullen third in storm gray flecked with opal lightning. 'The Edirr and Coman Lordan,' Rue whispered in Jame's ear."
↑To Ride a Rathorn, "Chapter XX: The Bear Pit", III — "After lunch, they practiced the Sene with the Edirr, who could be trusted to bring imagination and enthusiasm to any endeavor."
↑Dark of the Moon, "Chapter 6: The High Council" — " 'So that was what happened at Tiglon,' said Essien, the seated twin, with a solemnity undercut by a flash of pure mischief. 'We always wondered,' said the standing Essiar, in the same tone."
↑To Ride a Rathorn, "Chapter VIII: A Forgotten Name", V — " 'Yolindra of the Edirr may also try her hand, if only to tease Karidia.' "
↑Honor's Paradox, "Chapter IV: Relics" — " 'The Edirr suggest that there be a special award at the Lordan’s Presentation for the best dressed heir.' […] the petition was clearly just Lords Essien and Essiar teasing the Coman and Caineron, who tended to dress for every occasion as if for their coronation."
↑The Sea of Time, "Chapter VI: Challenges", I — "The Jaran, on the other hand, tended toward intellectual tests, the Edirr toward jokes such as ten-commands jogging naked through camp, painted blue."
↑Honor's Paradox, "Chapter V: The High Council", III — " 'Do the Edirr always do everything in twos?' asked Jame, thinking of the Lords Essien and Essiar who shared power in their house. 'More often than not. The Edirr produce so many twins that it saves trouble.' "
↑Bound in Blood, "Chapter V: Fractures", III — "It didn't matter that the Coman and Edirr were neighbors often at odds, though not in this class."
↑The Sea of Time, "Chapter II: A Willow Rampant" — " 'The Coman complain about the Edirr poaching on their side of the river. Sweet Trinity, can’t they manage their own territory?' Marc cleared his throat. 'It’s a bit more serious than that. I hear that sometimes one of the Lords Edirr leads a raid himself, for the sheer devilment of it.' "
↑To Ride a Rathorn, "Chapter VI: The Lordan's Coat", III — "Randir, Coman, and Caineron from east to west along the north wing; Jaran, Knorth, and Ardeth along the west; Danior, Edirr and Brandan from west to east along the south. By chance or design, this arrangement grouped allies and enemies, with a scattering of neutrals between them."