Clan d'Serrai is a part of North Spear and both are parts of Rathgar.
Realms that are a part of Clan d'Serrai:This is the rulership position for the realm.
The scholars agree that history as we view it began in the North with the arrival of the clans. One of them, the d'Serrai did settle on the northern bank of the Martana. At that time only the old gods knew whether this clan would forge a position of strength in these wild lands or whether its name would be forgotten.
In the very beginning, while the first longhouses were erected, friendships were wrought with the Bastur, the Valinor and the Skloddings. Thus western Rathgar should know an initial period of peace...
More may be found in these scrolls, gathered by the druids:
http://wiki.mightandfealtyfans.org/index.php?title=D%27Serrai