The last reference to him, as living, is in 1208, when an order for payment to him is on record, but Giraldus Cambrensis, in the second edition of his Hibernica, redacted in 1210, utters a prayer for his soul, "cujus animae propitietur Deus," a proof that he was no longer alive.
In 1918 he unearthed on the Palatine Hill a Greek marble statue of Victory dating back to the 5th century B.C. Besides his reports on Roman antiquities he published Hibernica, notes on burial places and customs of ancient Ireland (Eng.
Francisque Michel, London, 18 37), which, together with the Expugnatio hibernica of Giraud de Barri, constitutes our chief authority on this subject.
He wrote (1672-1684) a series of controversial letters against Pope Gregory VII.'s doctrine of papal supremacy over princes; a voluminous History of the Remonstrance (1674); Hibernica (1682), a worthless history of Ireland; in 1686 a reply to the Popery of Thomas Barlow (1607-1691), bishop of Lincoln; and other works.
Other works attributed, wrongly, to him are A Modest Defence of Public Stews (1724); The World Unmasked (1736) and Zoologia medicinalis hibernica (1744).
Tanner's Bibliotheca Britannico-Hibernica (1748), pp5247-248.
In addition to these works Camden compiled a Greek grammar, Institutio Graecae Grammatices Compendiaria, which became very popular, and he published an edition of the writings of Asser, Giraldus Cambrensis, Thomas Walsingham and others, under the title, Anglica, Hibernica, Normannica, Cambrica, a veteribus scripta, published at Frankfort in 1602, and again in 1603.