Originally posted by Anaximander
What's the oldest currently extant Great House? Ragara is her oldest remaining child (at least of political consequence), but the Scarlet Empress is still hundreds of years older than him and obviously had children before him. I would guess Tepet (since he had to have been her consort very early in Realm history), Iselsi, or Cynis (since I believe Eric has previously stated that they were probably founded by adopted children).
Iselsi, Peleps, and Tepet were all founded together as part of the first wave of Great Houses. House Ragara is the next-oldest of the currently extant houses, having been founded two-thirds of a century later.