This, as Olrik points out, appears to refer to a version of the story in which Athils had his fall from his horse, not at a ceremony at uppsala, but after the battle with Ali.
"Beowulf An Introduction to the Study of the Poem with a Discussion of the Stories of Offa and Finn"
R. W. Chambers
A mound near Vendel north of uppsala is known by his name.
"Beowulf An Introduction to the Study of the Poem with a Discussion of the Stories of Offa and Finn"
R. W. Chambers
An exploration of Ottar's mound showed a striking similarity with the uppsala mounds.
"Beowulf An Introduction to the Study of the Poem with a Discussion of the Stories of Offa and Finn"
R. W. Chambers