basiliscus was a byzantine emperor of the house of leo, who ruled briefly (january 475 ~ august 476). he was
the brother of empress aelia vernia, the wife of emperor leo i. his relationship with the emperor allowed him to pursue a military career that, after minor initial successes, ended in 468, when he led the disastrous byzantine invasion of vandal africa.

이 문장에서 밑줄 친 that의 쓰임은 무엇으로 쓰였나요 ???? 관계대명사인가요 ? 아님 지시대명사인가요 .. ??
그리고 he led ~ africa 까지 해석 좀 부탁드리겠습니다.

친절하고 자세한 답변 꼭 좀 부탁드립니다 ~~ .ㅜㅠ