972 - Svyatoslav was killed

Estonia
A battle between Oeselian and Icelandic Vikings took place on Saaremaa was described in thhe Icelandic Njál's saga.
Portugal
In June vikings raided Algarve.
Russia
Svyatoslav was ambushed and killed by Peschnegs. So Yaropolk became the new ruler until 978.
Wales
Gotfrid Haraldsson, brother of King Magnus of Island of Man and Limerick, attacked and conquered Anglesey. The Welsh historians record that a King Edgar gave "the men of Gotfrid sanction to remain in Mona.