There are 3 books in the Brethren Trilogy series. The newest book is Requiem which came out in 2008.

1
Brethren

Book cover of Brethren

The epic first novel in the million-selling Brethren trilogy. In the tradition of Bernard Cornwell, Conn Iggulden and Manda Scott, Brethren brilliantly evokes that extraordinary clash of civilizations known in the West as the Crusades.

From the burning plains of Syria to the filthy backstreets of Paris and London, Brethren…

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2
Crusade

Book cover of Crusade

Robyn Young is a compelling voice in historical fiction, writing in the tradition of Bernard Cornwell, Conn Iggulden and Manda Scott. This is the epic second novel in the million-selling Brethren trilogy.

It is 1274 and in the fortified city of Acre, the last major stronghold of the Crusaders in…

3
Requiem

Book cover of Requiem: Brethren Trilogy Book 3
1295 AD. The Christian empire in the Holy Land lies in ruins. Returning to Paris, Templar Knight Will Campbell is at a crossroads. He has sworn to uphold the principles of the Anima Templi, a secret brotherhood within the Order whose aim is peace - but peace seems ever more…