Prajñā was an important 9th century Buddhist monk from Gandhara

Gandhara

Gandhāra , is the name of an ancient kingdom , located in northern Pakistan and eastern Afghanistan. Gandhara was located mainly in the vale of Peshawar, the Potohar plateau and on the Kabul River...

, born in the area of modern Kabul

Kabul

Kabul , spelt Caubul in some classic literatures, is the capital and largest city of Afghanistan. It is also the capital of the Kabul Province, located in the eastern section of Afghanistan...

, Afghanistan

Afghanistan

Afghanistan , officially the Islamic Republic of Afghanistan, is a landlocked country located in the centre of Asia, forming South Asia, Central Asia and the Middle East. With a population of about 29 million, it has an area of , making it the 42nd most populous and 41st largest nation in the world...

.

He visited China during the Tang dynasty

Tang Dynasty

The Tang Dynasty was an imperial dynasty of China preceded by the Sui Dynasty and followed by the Five Dynasties and Ten Kingdoms Period. It was founded by the Li family, who seized power during the decline and collapse of the Sui Empire...

, and contributed several important (re-)translations of Sanskrit sutra

Sutra

Sūtra is an aphorism or a collection of such aphorisms in the form of a manual. Literally it means a thread or line that holds things together and is derived from the verbal root siv-, meaning to sew , as does the medical term...

s into Chinese. Some of his main works are:

• The Avatamsaka Sutra
  Avatamsaka Sutra
  The is one of the most influential Mahayana sutras of East Asian Buddhism. The title is rendered in English as Flower Garland Sutra, Flower Adornment Sutra, or Flower Ornament Scripture....
  
  or The Flower Adornment Sutra
• The Heart Sutra
  Heart Sutra
  The Heart Sūtra is a Mahāyāna Buddhist sūtra. Its Sanskrit name literally translates to "Heart of the Perfection of Transcendent Wisdom." The Heart Sūtra is often cited as the best known and most popular of all Buddhist scriptures.-Introduction:The Heart Sūtra is a member of the Perfection of...
  
   ( Dà chéng lǐ qù liù bō luó mì duō jīng)
• The Mahayana Sutra of Mind Meditation from the Jataka
  Jataka
  The Jātakas refer to a voluminous body of literature native to India concerning the previous births of the Buddha....
  
  ( Dà chéng běn shēng xīn dì guān jīng )

Prajñā reportedly befriended the Japanese monk Kūkai

Kukai

Kūkai , also known posthumously as , 774–835, was a Japanese monk, civil servant, scholar, poet, and artist, founder of the Shingon or "True Word" school of Buddhism. Shingon followers usually refer to him by the honorific titles of and ....

, future founder of the Shingon sect of Buddhism, during his pilgrimage to China. He is said to have helped Kūkai learn and understand Sanskrit source texts.