Who baptized Saint Paul?

In Acts 9, we learn that Ananias baptized Paul.

So Ananias departed and entered the house. And laying his hands on him he said, “Brother Saul, the Lord Jesus who appeared to you on the road by which you came, has sent me that you may regain your sight and be filled with the Holy Spirit.” And immediately something like scales fell from his e and he regained his sight. Then he rose and was baptized, and took food and was strengthened.

-Acts 9:17-19