How does Sultan Selim I’s Letter to Shah Ismail of Persia illuminate religious conflict in the early sixteenth century?

[In Muslim opinion, the Ottomans' right to rule rested on their success in war against the Christians and on their implementing the Holy Law in their lands. But this did not entitle them to dominate other Sunni Muslim states and when Ottoman arms first attempted to overthrow rival Muslim rulers throughout Asia Minor, religious resistance developed. In 1502 the threat increased when the head of the Safavid family, Ismail,