This is a closeup of John of Gaunt's face from a Renaissance painting.
Note the coat of arms in the top left corner of the painting. John's own coat of arms
combined (overlaid) with the arms of Pedro
. John's marriage to Constance of Castile (Pedro's daughter)
gave John a claim to the title of the King of Castile and Leon.
In the bottom half painting (over John's right leg), you can see a castle
and three lions (heraldic symbols of the kingdom of Castile and Leon).
Here is a fifteenth century manuscript illustration of John of Gaunt entertaining
the King of Portugal.
John of Gaunt was buried with his beloved first wife, Blanche, Duchess of Lancaster