Our Fiat, who are art at auction, hallowed be thy back seat.

A Fiat 500L Pope Francis rode in during his 2015 visit to Philadelphia was put up for an online auction Wednesday morning by the Archdiocese of Philadelphia.

The car is one of two Fiats the humble pope was transported in during his trip to Philly for the World Meeting of Families in September 2015. The other sold for $82,000 at an old-fashioned, in-person charity auction during the 2016 Philadelphia Auto Show. The winning bidder of that holy roller was Michael Chapman of Chapman Auto Dealers.

The net proceeds from the online auction, which is hosted by Charitybuzz, will benefit the 2017 Catholic Charity Appeal, according to a news release from the Archdiocese. A similar Charitybuzz auction for one of the Fiats that Pope Francis used in New York City during the same 2015 U.S. visit sold for $300,000 last year.

Pope Francis gets into the Fiat 500L in Philadelphia in 2015.
Archdiocese of Philadelphia/J. DiGidjunis
Pope Francis gets into the Fiat 500L in Philadelphia in 2015.

The vehicles were gifted by Fiat Chrysler to the Archdiocese of Philadelphia, which wanted to use them "in a manner consistent with Pope Francis' call to love and care for the poor," Archbishop Charles J. Chaput said in a statement.

A 2017 Fiat 500L has a manufacturer's suggested retail price under $22,000, according to Kelley Blue Book. The estimated value of the Pope Francis Fiat, according to the Charitybuzz auction, is $75,000.

The auction remains open until Dec. 20. As of Wednesday evening, the highest bid was $10,500.

But buyers beware — the winning bidder can't do anything sacrilegious with the vehicle, like turning it into a tiny Weinermobile or making it the next Scooby Doo Mystery Machine.

According to the bidding parameters: "BIDDER SHALL BE RESPONSIBLE FOR ENSURING THAT THE PROPERTY IS NOT REPRESENTED OR USED IN SUCH A MANNER THAT WOULD IMPROPERLY OR IMMORALLY REFLECT UPON HIS HOLINESS OR THE ROMAN CATHOLIC CHURCH."