
June 13
1373 – Anglo-Portuguese Alliance between England (succeeded by the United Kingdom) and Portugal is the oldest international agreement in the world which is still in force.
1525 – Ex-Catholic priest Martin Luther married Katharina von Bora, against the celibacy rule decreed by the Roman Catholic Church for priests and nuns.
1611 – Astronomer Johannes Fabricius published Narratio de maculis in sole observatis et apparente earum cum sole conversione (Narration on Spots Observed on …