The poem also alludes to Rǫgnvaldr's right to the kingship of Tara, and appears to evince the prospect of seizing power in Dublin. Rǫgnvaldr's antecessors were certainly closely associated with the Norse-Gaelic Kingdom of Dublin. However, with the kingdom's collapse at the hands of English adventurers in 1170, and the ongoing entrenchment of the English throughout Ireland itself, the Crovan dynasty found itself surrounded by this threatening, rising new power in the Irish Sea zone. Despite the dynasty's original opposition to the English in Dublin, it did not take long to realign itself with this new power, as exemplified through a marital alliance between Rǫgnvaldr's sister, Affrica, and one of the most powerful incoming Englishmen, John de Courcy.