'Assistant' in the Bible

Now Herod was having an angry quarrel with the people of Tyre and Sidon. So they joined together and presented themselves before him. And after convincing Blastus, the king's personal assistant, to help them, they asked for peace, because their country's food supply was provided by the king's country.

When they arrived in Salamis, they began to proclaim the word of God in the Jewish synagogues. (Now they also had John as their assistant.)