Shahnameh or Shahnama (Persian: شاهنامه, lit. "The Book of Kings") is a long epic poem written by the Persian poet Ferdowsi for Sultan Mahmud of Ghazni between c. 977 and 1010 CE and is the national epic of Greater Iran. Consisting of some 50,000 "distichs" or couplets (two-line verses), the Shahnameh is one of the world's longest epic poems. It tells mainly the mythical and to some extent the historical past of the Persian Empire from the creation of the world until the Muslim conquest in the seventh century. Iran, Azerbaijan, Afghanistan, Tajikistan and the greater region influenced by Persian culture such as Armenia, Dagestan, Georgia, Turkey, Turkmenistan and Uzbekistan celebrate this national epic.
Learn more on wikipedia