from The Anglo-Saxon Chronicle

A.D. 1016. When the king understood that the army was up,
then collected he the fifth time all the English nation, and went
behind them, and overtook them in Essex, on the down called
Assingdon; where they fiercely came together. Then did Alderman
Edric as he often did before -- he first began the flight with
the Maisevethians, and so betrayed his natural lord and all the
people of England. There had Knute the victory, though all
England fought against him! There was then slain Bishop Ednoth,
and Abbot Wulsy, and Alderman Elfric, and Alderman Godwin of
Lindsey, and Ulfkytel of East-Anglia, and Ethelward, the son of
Alderman Ethelsy . And all the nobility of the English
nation was there undone!

A.D. 1020. This year went the king to Assingdon; with Earl Thurkyll, and Archbishop Wulfstan, and other bishops, and also abbots, and many monks with them; and he ordered to be built there a minster of stone and lime, for the souls of the men who were there slain, and gave it to his own priest, whose name was Stigand; and they consecrated the minster at Assingdon.

Although the church of St Andrews has stood on the same spot for nearly 1000 years, the oldest headstones only date back to the last century, due to the relatively small size of the churchyard, which is still in use.