Beorhtwulf of Mercia
...that during the reign of Beorhtwulf of Mercia, London, the chief trading centre of Mercia, was attacked twice, in 842 and again in 851, by Viking armies?
...that during the reign of <b id="mwChE"><a class="mw-redirect" href="./King_Beorhtwulf_of_Mercia" id="mwChI" rel="mw:WikiLink" title="King Beorhtwulf of Mercia">Beorhtwulf of Mercia</a></b>, <a href="./London" id="mwChM" rel="mw:WikiLink" title="London">London</a>, the chief trading centre of <a href="./Mercia" id="mwChQ" rel="mw:WikiLink" title="Mercia">Mercia</a>, was attacked twice, in 842 and again in 851, by <a class="mw-redirect" href="./Viking" id="mwChU" rel="mw:WikiLink" title="Viking">Viking</a> armies?