An diesem Tag vor 881 Jahren wurde Portugal von der Krone Kastiliens offiziell als unabhängiges Land anerkannt.

Why ruining the borders or a potential “united Iberia” ?

Interesting era in Iberian history. The Almoravids were infamously harsh rulers, even by Medieval standards, and were widely hated in Iberia and Morocco. About three years after this map they would be conquered by the Almohads, who were considered far worse.