Sakanoue no Tamuramaro
Note: there are different shogun titles. For example Kose no Maro had the title of . Ki no Kosami had the title of in 789 which is less important than "Sei-i Taishōgun". Ōtomo no Otomaro was the first person who was granted the title of . Sakanoue no Tamuramaro was the second, and Minamoto no Yoritomo was third person who had the title of "Sei-i Taishōgun".