Refer to the article "Harun al-Rashid & One Thousand and One Nights." Which two details support the central idea that Harun al-Rashid was an extremely rich and learned ruler?

“…al-Rashid became the caliph -- or ruler -- of an Islamic state whose capital was the city of Baghdad."

“…during al-Rashid's rule, the Islamic world began to experience an explosion of cultural and intellectual growth.”

“Libraries sprouted in cities across the caliphate, including the wonderfully named House of Wisdom in Baghdad, which al-Rashid helped found.”

“…al-Rashid was the second son of his father, al-Mahdi, an important political leader.”