This mound is called a round barrow in the scheduled monument record (though maybe there’s some doubt about its origins).
To quote the Furness Family History Society: “In a field called Ellabarrow is an oval tumulus crowned with trees, and in the next field is a pit from which its earth is thought to have come, it is said that in the barrow the mythical Lord Ella is said to be buried along side his golden sword.”
