Amalrician

The Amalricians were a pantheist, free love movement named after Amalric of Bena. The beliefs are thought to have influenced the Brethren of the Free Spirit.

The beginnings of medieval pantheistic Christian theology lie in the early 13th century, with theologians at Paris, such as David of Dinant, Amalric of Bena, and Ortlieb of Strassburg, and was later mixed with the millenarist theories of Gioacchino da Fiore.

Fourteen followers of Amalric began to preach that "all things are One, because whatever is, is God." They believed that after the age of the Father (the Patriarchal Age) and the age of the Son (Christianity), a new age of the Holy Spirit was at hand. The Amalricians, who included many priests and clerics, succeeded for some time in propagating their beliefs without being detected by the ecclesiastical authorities.

In 1210, Peter of Nemours, Bishop of Paris, and the Chevalier Guérin, an adviser to the French King Philip II Augustus, obtained secret information from an undercover agent called Master Ralph. This intelligence gathered laid bare the inner workings of the sect, enabling authorities to arrest its principals and proselytes. That same year, a council of bishops and doctors from the University of Paris assembled to take measures for the punishment of the offenders. The ignorant converts, including many women, were pardoned. Of the principals, four were condemned to imprisonment for life. Ten members were burned at the stake.

...
Wikipedia