This is the generally attributed death date of Duke Erik and Duke Valdemar of Sweden — intentionally starved to death at the order of their royal brother, according to the 14th century Erikskrönikan.
This is pretty borderline as an execution, to be sure, but brutal games of thrones ran in these men’s family. Their grandfather Birger Jarl was a powerful duke who got his young child elected king when the throne came open in 1250, possibly circumventing family of the preceding monarch.
We’re still in the family lore here, but past proved to be prologues for King Magnus’s kids. Magnus had his oldest child Birger set up to succeed, but Birger’s brothers Erik and Valdemar would struggle with the official heir for power after Magnus died.
The boys had a civil war in the 1300s that even resulted in Erik and Valdemar deposing Birger and clapping him in a dungeon — an outcome reversed by pressure from the Norwegians and Danes.
Come the 1310s, things were still tense. Situated on impressive domains of their own — Erik was Duke of Sodermanland, Valdemar, Duke of Finland — the kid brothers looked a potent threat to King Birger once again. Not fancying another stay in the family prison, Birger pre-emptively arrested his brothers at the family Christmas celebration in 1317.
Birger would learn that you can’t solve all family problems by starving them. Weeks after his fratricide, the brothers’ supporters ousted him for good.
Birger fled to exile. His own son, Magnus Birgersson, remained to answer at the executioner’s block for his father’s sins … while his three-year-old cousin, Erik’s son King Magnus, succeeded the throne and held it until 1364.
Cold comfort to the dead dukes, perhaps, but they at least had the consolation of being exalted as “holy dukes” thanks to the winner-written history.