Hanshan Deqing
Hanshan Deqing was a prominent Buddhist monk of the late Ming Dynasty, and is considered a late Chan patriarch.
He is known for devoting four years to copying a sutra in his own blood, mixed with gold, and invoking the name of Amitabha after completing each word.
References
- Conrad Schirokauer, et al, A Brief History of Chinese and Japanese Civilizations, Fourth Edition, Cengage Learning (2012), 260.