The Cross of the Order of Christ at the Convent of Christ, Tomar
The cross of the Order of Christ at Tomar, the Portuguese house that had been the Templars' headquarters and became the new order's seat after 1319. The form is the Templar cross with a plain cross laid over it — a deliberate statement that the order was a continuation, not a replacement.
When Clement V dissolved the Templars in 1312 their property was supposed to pass to the Hospitallers. In Portugal it did not. King Dinis negotiated a new order, confirmed by John XXII in 1319, which took over the Templar estates, the Templar castle at Tomar, and a version of the Templar cross. The Order of Christ later paid for the voyages of Henry the Navigator and painted its cross on the sails of Portuguese ships, which is how a suppressed crusading order ended up on the Atlantic. See how the Templars survived in Portugal.
CC BY 2.0 — source (Wikimedia Commons). Free to reuse under the stated licence.