Northman
... that while Northman and Waltheof were ealdormen in northern Northumbria, Bamburgh was sacked by the Viking king Óláfr Tryggvason?
... that while <b id="mwAb8"><a class="mw-disambig" href="./Northman" id="mwAcA" rel="mw:WikiLink" title="Northman">Northman</a></b> and <a href="./Waltheof_of_Bamburgh" id="mwAcE" rel="mw:WikiLink" title="Waltheof of Bamburgh">Waltheof</a> were <a href="./Ealdorman" id="mwAcI" rel="mw:WikiLink" title="Ealdorman">ealdormen</a> in northern <a href="./Northumbria" id="mwAcM" rel="mw:WikiLink" title="Northumbria">Northumbria</a>, <a href="./Bamburgh" id="mwAcQ" rel="mw:WikiLink" title="Bamburgh">Bamburgh</a> was sacked by the <a class="mw-redirect" href="./Viking" id="mwAcU" rel="mw:WikiLink" title="Viking">Viking</a> king <a class="mw-redirect" href="./Óláfr_Tryggvason" id="mwAcY" rel="mw:WikiLink" title="Óláfr Tryggvason">Óláfr Tryggvason</a>?