>If battle of Aljubarrota happens, could we have Monastery of Batalha as a work of art if Portugal wins?

>Is there any content about the Sebastianismo?

>It was a "Arthurian-like" common myth around early Modern Portugal.

>D. Sebastian I disappeared while fighting the Moroccans, abd was never found alive or dead. After that, people started to believe he would come back someday to return Portugal to it's glory.

>As expected, it never happened, and IRL when ended up with the Iberian Union under Spain.

We don't have 'Sebastianismo' itself, as that's very tied to the Succession Crisis that happened after his death, and the subsequent crowning of Philip II of Spain as king of Portugal. However, we do have an event about the campaign of Alcácer Quibir: