From the article:
* Although this is well into the period when Catholic clergy were supposed to be practicing celibacy, Arason’s indifference to this particular mortification of the flesh is just another bit of his charm. With his mistress Helga Sigurdardottir, he sired nine sons and daughters, marrying them into politically advantageous allegiances where possible. At least eight subsequent Lutheran bishops sprang from his seed; by the present, “virtually all Icelanders can validly claim direct descent” from Jon Arason, according to Iceland, the First New Society.
In the next century, Cardinal Richelieu (French, of course) was widely rumored to have spread his seed around under Louis XIII, something neither proven nor acknowledged, but he did alienate the Pope and celibacy among the clergy became policy shortly thereafter.