The Prophet
Landlubber
Yeap, it's a trinket, but i think it's name is Cross of Antonio de Souza. I have it, but it's from the treasure on Turks island or from the chest in the dungeon in Bermuda. Also it's better to make a new post about it. Or u can cheat and get ti from Debug.
As it was posted above I can confirm that Cross of Antonio de Souza is obtained also through Spanish Quest.
After you have spoken with Cardinal de Souza in his chamber, recieving quest to force jansenits to buy indulgence from pope for 50k each head - some priest meets you on the street of Santiago and asks you not to kill those jansenits. If you immediately return to de Souza and report him this encounter he will grant you a token of his gratitude: his cross of course
Similar thing happens if you decide to obtain Gospel of Judas Iscariot (rescued Jansenit Merchant asks you to find this book - it's worth your time but not necessary for quest succes), if you don't mention fact that you already have it to the Merchant in Curacao and turn this Gospel to Cardinal de Souza instead he will give you a second token: a golden cuirass (35% reduced damage and weights only 13(?)).
As you can see - the game has plenty of cuiriousities