For 10 points, name this country, home of the Braganza dynasty and Henry the Navigator.
One king from this country came to power after defeating his mother Teresa at the battle of St. Mamede, and the remnants of Celtic inhabitations in this country are called citanias. H. R. Lang compiled a book of songs written during the reign of King Dennis I of this country, and another of its rulers came to power after defeating John of Castile at the Battle of Aljubarrota. Another king from this country captured the port city of Ceuta. That king established the city of Sagres and was the founder of the Aviz dynasty, and it signed the Treaty of Tordesillas with Spain. For 10 points, name this country, home of the Braganza dynasty and Henry the Navigator.
One king from this country came to power after defeating his mother Teresa at the battle of St. Mamede, and the remnants of Celtic inhabitations in this country are called citanias.
{Portugal}