Which person called on all christian warriors to fight against muslims in order to reclaim the holy land of jerusalem

sultan Saladin

Explanation:

Numbered about 1000 men. The Third Crusade (1189–1192) was an attempt by the leaders of the three most powerful states of Western Christianity (England, France and the Holy Roman Empire) to reconquer the Holy Land following the capture of Jerusalem by the Ayyubid sultan Saladin in 1187.

Saladin

Explanation:

On September 17, Muslim troops came against the walls of Jerusalem, and on September 20, Saladin himself at the head of his army besieged Jerusalem, which contained about 30,000 residents and another 30,000 refugees from around the Christian Holy Land.

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.

b. sec, foreign relations