What is "eikonoklastes"

Eikonoklastes (from the Greek εἰκονοκλάστης, "iconoclast") is a book by John Milton, published October 1649. In it he provides a justification for the execution of Charles I, which had taken place on 30 January 1649. The book's title is taken from the Greek, and means " Iconoclast" or "breaker of the icon", and refers to Eikon Basilike, a Royalist propaganda work. The translation of Eikon Basilike is "icon of the King"; it was published immediately after the execution. Milton's book is therefore usually seen as Parliamentarian propaganda, explicitly designed to counter the Royalist arguments.