Can anybody identify this plant please.

jools.middle

Bought last year in a pot with violas and ajuga   I expected it to die over winter but it has come back lovely.  Thanks 

ShepherdsBarn

Astrantia, possibly.

Asarum

Artemisia vulgaris, variegated mugwort.

jools.middle

Thank you, that’s most helpful.  I have just read that it spreads rapidly and is best kept in a pot to stop the spread.