Jeb and Blake go in search of John the Baptist's resting place. Content Warning: Human remains on screen. Discussion of murder.

Beheading John the Baptist (wiki)

Salome (play)

In 2018 the murder of Bishop Epiphanius took place and rocked the religious community -- not important for this episode but it popped up a lot in my searching.

San Silvestro "head" shown in intro

Same - but wiki article

Nimoy Fashion Alert (NFA Wardrobe consulting by The Hogtown Rake, Pedro Mendes)

The "head" of John the Baptist at San Silvestro:

Art historian Michael Patroconni (Petroccione?)

I think Jeb and I found this to be the most fun part of the episode:

Gerald Larue obituary

Herod Antipas (the Herod that executed JTB)

Wadi El Natrun

The Cave of John the Baptist