An influential Islamic scholar and preacher in Jatinom (Klaten), Central Java, in the Mataram-Islam era. He was closely associated with Sultan Agung Hanyakrakusuma and declined the offered post of Bupati Nayaka in order to remain a religious teacher (id.wikipedia, "Makam Ki Ageng Gribig"; Central Java provincial tourism portal). Returning from the Hajj he distributed apem cakes; after his death this became the annual Yaqowiyu tradition, held on the Friday in mid-Safar, its name taken from his prayer "Yaa Qowiyyu" (O Almighty, grant us strength). His red-stone-and-wood tomb in Jatinom is a major pilgrimage and cultural site.