Colasterion

Colasterion (from the Greek word for "instrument of punishment" or "house of correction") was published by the English poet and polemicist John Milton with his Tetrachordon on 4 March 1645. The tract is a response to an anonymous pamphlet attacking the first edition of The Doctrine and Discipline of Divorce. Milton makes no new arguments, but harshly takes to task the "trivial author".

In the tract, Milton promotes an idea of marital separation, and, in his situation, a separation from his previous wife.