In central and west Asia, Buddhist influence grew, through Greek-speaking Buddhist monarchs and ancient Asian trade routes, a phenomenon known as Greco-Buddhism. An example of this is evidenced in Chinese and Pali Buddhist records, such as "Milindapanha" and the Greco-Buddhist art of Gandhāra. The "Milindapanha" describes a conversation between a Buddhist monk and the 2nd-century BCE Greek king Menander, after which Menander abdicates and himself goes into monastic life in the pursuit of nirvana. Some scholars have questioned the "Milindapanha" version, expressing doubts whether Menander was Buddhist or just favourably disposed to Buddhist monks.