Frontispiece of work by Peter of Spain — By Stanisław Polak (Stanislaus Polonus) - Halina Tchórzewska-Kabata, Maciej Dąbrowski (2000). Nad złoto droższe: skarby Biblioteki Narodowej (More precious than gold: treasures of the National Library). Biblioteka Narodowa. ISBN 83-70092-97-7, Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=12844512
Frontispiece of work by Peter of Spain
By Stanisław Polak (Stanislaus Polonus) - Halina Tchórzewska-Kabata, Maciej Dąbrowski (2000). Nad złoto droższe: skarby Biblioteki Narodowej (More precious than gold: treasures of the National Library). Biblioteka Narodowa. ISBN 83-70092-97-7,
Papal Palace of Viterbo — Viterbo was the papal seat from 1257 to 1281, due to hostility and constant violence in Rome Photo Credit: By Sailko - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=62249660
Papal Palace of Viterbo
Viterbo was the papal seat from 1257 to 1281, due to hostility and constant violence in Rome
Pope John XXI — Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=12255552
Pope John XXI — in the Basilica of Saint Paul Outside the Walls, Rome Photo Credit: By Unknown - [1], Public Domain, https://commons.wikimedia.org/w/index.php?curid=42731516
Pope John XXI
in the Basilica of Saint Paul Outside the Walls, Rome
The Umayyad Mosque at night — Photo Credit: By alazaat - https://www.flickr.com/photos/alazaat/2356796549/sizes/o/, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=6504129