Tordesillas & Zaragoza Treaties — Lines dividing the non-Christian world between Castile and Portugal: the 1494 Tordesillas meridian (purple) and the 1529 Zaragoza antimeridian (green)
Photo Credit: By Lencer - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=3194339