Sebastian I was King of Portugal and the Algarves from 11 June 1557 to 4 August 1578.
Sebastian was almost certainly killed in battle. He was last seen riding headlong into the enemy lines.
Sebastian I is often referred to as The Desired, for the Portuguese people longed for his return, to end the decline of Portugal that had occurred because of his death.
The poster celebrates his Birthday: 20 January 1554.