In April 871 King Æthelred died and Alfred acceded to the throne of Wessex and the burden of its defence, even though Æthelred left two under-age sons, Æthelhelm and Æthelwold. This was in accordance with the agreement that Æthelred and Alfred had made earlier that year in an assembly at an unidentified place called Swinbeorg. The brothers had agreed that whichever of them outlived the other would inherit the personal property that King Æthelwulf had left jointly to his sons in his will. The deceased's sons would receive only whatever property and riches their father had settled upon them and whatever additional lands their uncle had acquired. The unstated premise was that the surviving brother would be king. Given the Danish invasion and the youth of his nephews, Alfred's accession probably went uncontested.