Cheng Yaojin (589-665), also known as 程知节 chéng​zhī​jié, a famous general during the Tang Dynasty known for his bravery; one of the 24 founding officials of the Tang honored at Lingyan Pavilion

(in the idiom 半路杀出个程咬金 bàn​lù​shā​chū​gè​chéng​yǎo​jīn) someone who appears unexpectedly and interferes with a plan or situation