Not many of these exist as the Japanese version of vassalage seems generally, to have been more flexible, less formal and changeable than in Europe.
I am Iehira, seventh son of Nakano Goro, religious name, Teishin. My father holds the office of jito on a part of the Yuyama estate, Shinano Province. As for me, I proved my greatest loyalty to your lordship on the eighth day of the fifth lunar month, and I am available to do the same at all of the battles in the future, by obeying you and acting always with loyalty to you. With this document, I present myself to you with all of my respect.
(signature on back of document) Year 3 of Genko, fifth moon, fourteenth day Fujiwara Iehira Counter-signed and approved: Ashikaga Takauji (seal)