Purple flower. lol.

I saw this flower today in an inner garden at a monastery.
I have not seen this one before either. The leaves look like a nettle plant. You can also see that from the small inset.
Maybe someone knows what this plant is called. It is not a small plant. It was at least 1 meter high.
Greetings.
I did not have time yesterday and today to look at your blips but I will catch up.