The Founding of the Order of Souls
After witnessing a vision from an enchanted skull, a young Madame Olivia seeks the Sea of Thieves with two friends and sets up the Trading Company as a means to attain the self she saw in her vision.
The Gold Hoarder Heathcliffe is instrumental in her setting up the Trading Company. The Order of Souls works closely with the Gold Hoarders, providing them with maps to buried treasure that they gleam from scrying the skulls of dead pirates. They also wish to rid the Sea of Thieves of its skeletal denizens and to learn all of its arcane secrets.
Source
Sea of Thieves Origins #3: The Vision of Order