text: After this empire's final ruler was assassinated on a parade ground, its lands were invaded by Demetrius I, the Invincible.
full_question: After this empire's final ruler was assassinated on a parade ground, its lands were invaded by Demetrius I, the Invincible. Strabo relates how Deimachus served for many years as an ambassador to this empire. A governing manual produced under this empire has a name that loosely translates as "The Science of Politics." This empire's second ruler, Bindusara, appointed his son as viceroy of Ujjayini; that son conquered Kalinga before converting to Buddhism and promulgated many edicts on stone pillars. For 10 points name this Indian Empire led by Chandragupta and Ashoka.
first_sentence: After this empire's final ruler was assassinated on a parade ground, its lands were invaded by Demetrius I, the Invincible.