Guan Ding (灌顶) was a Buddhist monk of the Sui Dynasty who authored commentaries on Tiantai foundational texts, notably his influential commentary on the Great Calming and Contemplation (摩诃止观). Zhan Ran (湛然) of the Tang Dynasty was a prominent Tiantai scholar who further developed its doctrines. Honjun (本纯) was a Japanese monk from the Kamakura period who played a role in disseminating Tiantai teachings in Japan.