Acts 12:12

12 When this had dawned on him, he went to the house of Mary the mother of John, also called Mark, where many people had gathered and were praying.

Read Acts 12:12 Using Other Translations

And when he had considered the thing, he came to the house of Mary the mother of John, whose surname was Mark; where many were gathered together praying.
When he realized this, he went to the house of Mary, the mother of John whose other name was Mark, where many were gathered together and were praying.
When he realized this, he went to the home of Mary, the mother of John Mark, where many were gathered for prayer.