Short answers, pulled from the story.
Menander I Soter, sometimes called Menander the Great, was an Indo-Greek king who reigned around 165 or 155 to 130 BC. He administered a large territory in the northwestern Indian subcontinent and Central Asia and is regarded as the greatest and most well-known of the Indo-Greek kings.
Menander I's empire stretched from the Kabul River in the west to the Ravi River in the east, and from the Swat River valley in the north to Arachosia, the Helmand Province. His capital is supposed to have been Sagala, believed to be modern Sialkot in Pakistan. The geographer Strabo, quoting Apollodorus of Artemita, wrote that more tribes were subdued by the Bactrian Greeks than by Alexander, "by Menander in particular".
The Milinda Panha, "The Questions of King Milinda", is a classical Pali Buddhist text recording discussions between King Milinda, identified with Menander I, and the Buddhist sage Nagasena. In it, Menander is said to adopt the Buddhist faith, hand his kingdom to his son, and attain Arahatship. Its style of dialogue may have been influenced by Plato's Dialogues.
The accounts disagree. Buddhist tradition says Menander I handed his kingdom to his son and retired from the world, while Plutarch reports that he died in camp during a military campaign in 130 BC. Plutarch adds that the cities contested his relics until they agreed to share his ashes equally and erect monuments, probably stupas, to him.
Menander I left behind more silver and bronze coins than any other Indo-Greek king, with finds as far as Britain, and they are the main source of his history. He was the first Indo-Greek ruler to depict Athena Alkidemos throwing a thunderbolt and the first to put his own portrait on coins as a custom new to Indian rulers. His coins bear the legend ΒΑΣΙΛΕΩΣ ΣΩΤΗΡΟΣ ΜΕΝΑΝΔΡΟΥ and, in Kharoshthi, MAHARAJA TRATARASA MENADRASA.
Menander I was a patron of Greco-Buddhism, and the conversion suggested by the Milinda Panha appears to have triggered Buddhist symbolism on the coinage of close to half the kings who succeeded him. He is thought to have built the second oldest layer of the Butkara stupa, and later rulers adopted the vitarka mudra gesture and the Pali title "Dharmikasa", meaning "follower of the Dharma".