VATICAN CITY (AP) — Two pontiffs, both wearing white, both called “pope” and living a few yards from one another, with the same key aide serving them.

The Vatican’s announcement Tuesday that Pope Benedict XVI will be known as “emeritus pope” in his retirement, be called “Your Holiness” and continue to wear the white cassock associated with the papacy has fueled concerns about potential conflicts arising from the peculiar reality now facing the Catholic Church: having one reigning and one retired pope.

Benedict’s title and what he will wear have been a major source of speculation since the 85-year-old pontiff stunned the world and announced he would resign, the first pope to do so in 600 years.