Grammaticus Saxo, The Danish History, Books I-IX
“ By a device as cunning as it was strange, Thyra's pretended modesty passed into an acknowledgment of her future offspring. Nor did fate disappoint her hopes. Soon she was the fortunate mother of Kanute and Harald. When these princes had attained man's estate, they put forth a fleet and quelled the reckless insolence of the Sclavs. Neither did they leave England free from an attack of the same kind. Ethelred was delighted with their spirit, and rejoiced at the violence his nephews offered him; accepting an abominable wrong as though it were the richest of benefits. ”
