On Hiski I do see an Elias born in 1825 in Kivijarvi. But no indication he was a Piispanen, the farm name was Minnila, parents Henrik and Eva.
I have an Elias Piispanen in my tree but he was born abt 1700 in
Also on Hiski I see Kaisa Piispanen, married to Henrik Kinnunen giving birth to Lars Henrik in 1856 in Kivijarvi.
While you are checking into this, you might find Piispanen is a very interesting name in Finland. As far as I know, Piispanens were descendants of Simon Krook, the first Bishop of Viipuri. There's a very detailed genealogy on the net. Just type in Simon Marci Krook, you might find some of your people in there.