Jakuzen was a 12th-century priest of the Buddhist Tendai sect, residing outside the capital of Kyoto in Ōhara. His two brothers, Jakuchō and Jakunen, were also poet-priests. Together, the three were known as the Ōhara sanjaku (the three “jaku” of Ōhara). Jakuzen left behind three manuscripts of waka poetry. Forty-seven of his poems were published in imperial poetry anthologies of the late 12th century and later.