Definitely third person, past tense. I don’t see how you could have 1st person past tense. I’m going out on a limb and saying it doesn’t exist. Much more experienced writers here to confirm or deny.
Not sure I understand this, Terry. Of course you can have first person past tense. 😕
That’s why I’ll never write in 1st person. 😀
1st person, present tense: I’m going to the store.
1st person, past tense: I went to the store.