The history of that conquest itself is mainly inferential; there is the flebilis narratio of Gildas, vague and rhetorical, moral rather than historical in motive, and written more than a century after the conquest had begun, and the narrative of the Welsh Nennius, who wrote two and a half centuries after Gildas, and makes no critical distinction between the deeds of dragons and those of Anglo-Saxons.
The most important of his writings is the Narratio de bellis apud Lewes et Evesham.
Pars prima, in qua primum de rebus per Angliam et Scotiam gestis atque in primis de horrenda sub Maria nuper regina persecutione narratio continetur.
But his assent to this was only extracted from him in 1540 by the importunities of his friends, especially of his enthusiastic disciple George Joachim Rheticus (1514-1576), who printed, in the Narratio prima (Danzig, 1540), a preliminary account of the Copernican theory, and simultaneously sent to the press at Nuremberg his master's complete exposition of it in the treatise entitled De revolutionibus orbium coelestium (1543).
EUthyinius Zygadenus, Narratio de Bogomilis, ed.
Riley; the Narratio de bellis apud Lewes et Evesham, ed.
He also published Narratio de Libris Revolutionum Copernici (Gedenum, 1540), which was subsequently added to editions of Copernicus's works; and Ephemerides until 1551, which were founded on the Copernican doctrines.