Many years ago, you had to go to the church that the King or Queen told you to go to.

If you didn't, you were in trouble.

You could be arrested, thrown into prison or even executed!

In those days, there was a Catholic priest called John Gerard. He used to travel around the country holding Catholic services secretly in people's houses.

One day, while he was praying with his friends, the soldiers arrived.

They arrested him and took him to the Tower of London.