The Sisters of finding Jesus in the Temple were a Catholic religious order popularly known as Blue nuns due to the colour of their habit. They were the name of a pre-reformation Catholic order founded in London at the time of the crusades by an unknown dean.
A new order was founded in England in 1860 by Cardinal Wiseman and it subsequently spread to France. In England a center of their work was Clifton diocese which they left in 2010.
References
Sisters of finding Jesus in the Temple Wikipedia(Text) CC BY-SA