Saka, or Sakan, was a variety of Eastern Iranian languages, attested from the ancient Buddhist kingdoms of Khotan, Kashgar and Tumshuq in the Tarim Basin, in what is now southern Xinjiang, China. It is a Middle Iranian language. The two kingdoms differed in dialect, their speech known as Khotanese and Tumshuqese.

Buddhism, also known as Buddha Dharma and Dharmavinaya, is an Indian religion and philosophical tradition based on teachings attributed to the Buddha. It is the world's fourth-largest religion, with over 520 million followers, known as Buddhists, who comprise seven percent of the global population. Buddhism originated in the eastern Gangetic plain as a śramaṇa–movement in the 5th century BCE, and gradually spread throughout much of Asia via the Silk Road.