In the beginning of Acts, the writer (traditionally believed to be Luke) refers to a previous "account" or "treatise" that he had written. This likely refers to the Gospel of Luke, which was also written by Luke and serves as a companion volume to the Book of Acts. The Gospel of Luke ends with Jesus' ascension, and Acts begins with Jesus' ascension and the events that follow, making it a seamless continuation. Therefore, the "letter" or "account" mentioned at the beginning of Acts is commonly understood to be the Gospel of Luke.
Theophilus is mentioned at the beginning of the Gospel of Luke and the Book of Acts. The name "Theophilus" means "friend of God" or "loved by God" in Greek, suggesting that it could also be a symbolic name representing any believer who loves God.
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ACTS