The plaque in front of the altar marks the spot where the grave used to be. The remains are long gone.
Summary from Wikipedia
Milton's poetry and prose reflect deep personal convictions, a passion for freedom and self-determination, and the urgent issues and political turbulence of his day. Writing in English, Latin, Greek, and Italian, he achieved international renown within his lifetime, and his celebrated Areopagitica (1644), written in condemnation of pre-publication censorship, is among history's most influential and impassioned defences of free speech and freedom of the press. His desire for freedom extended into his style: he introduced new words (coined from Latin) to the English language, and was the first t ...
Author of contribution: Janez, published 22. 2. 2017