The strongest evidence we have is one manuscript which says that the poem was written by ` Willielmi de Langlond ' , son of ` Stacy de Rokayle , who died in Shipton-under-Wichwood , a tenant of the Lord Spenser in the county of Oxfordshire ' . This directly ascribes ` Perys Ploughman ' to one ` Willielmi de Langlond ' , son of ` Stacy de Rokayle , who died in Shipton-under-Wichwood , a tenant of the Lord Spenser in the county of Oxfordshire ' .