Zhanran (湛然), a monk of the Tang Dynasty, was a prominent disciple of Zhiyi and is renowned for his commentaries on Tiantai Buddhist scriptures, particularly his extensive work on the *Möngjūśrī Bodhisattva's Ten Great Vows* (文殊師利菩薩十種大願). He is considered the reviver and systematizer of the Tiantai school during the Tang period.