Close but it's thiolliers quest. You have to start with him before this

If you do it 4 times you get dialog from st Trina. And next playthrough find thiollier and do his questline and he will meet you down there later in his quest. He will also help fight Leda and radahn. You can also do the same for ansbach

Yeah I had to look it up to figure out what the heck this guy was😂

Thanks