why is bisham church historically important?

"Just before you come to the abbey, and right on the river's bank, is Bisham Church, and, perhaps, if any tombs are worth inspecting, they are the tombs and monuments in Bisham Church. It was while floating in his boat under the Bisham beeches that Shelley, who was then living at Marlow (you can see his house now, in West street), composed THE REVOLT OF ISLAM."