Duarte looked at the letter the messenger had given him. He recognized the seal on the letter immediately, it belonged to his father Alfonso IV, the King of Portugal.
Dear Duarte
As you are the lord of Porto and Bragança, I request that you find out what your servants produces to make a living, in order to better increase the wealth of our nation. I suggest that you go around and visit the different villages of your duchy. It would probably be best to start in Bragança.
Your father, Afonso IV
As Duarte finished reading the letter, he briefly considering merely sending back a bottle of wine as reply to his father, he was very well aware of what his subjects made for a living, and he was very fond of it.
But no, he was the Prince of Portugal, and as such it was his duty to watch over Porto and Bragança, and if watching over meant that he had to travel the land for some time, he would do so. Besides, this gave him an excellent opportunity to refresh his wine cellar.
***
As Duarte rode out from the capital city of the province, he looked around and couldn't help but smile a little. Sure, there was grain fields, but the landscape was mostly dominated by vineyards, whose products were often referred to as "The Blood of Bragança", something Duarte thought was very well fitting.
***
The following days was very similar to the first one, some fields with grain, and then a lot of vineyards, but Duarte had been anticipating this day since he departed from his mansion. This time he would be visiting the newly constructed monastery, which was already quite famous for producing the best wine in all of Bragança, if not in Portugal or even in the Iberian Peninsula. One thing Duarte knew for sure; this was the wine he would prefer to stock up on.
As Duarte and his escort approached the monastery, he sent a few servants to buy some wine from the monks. It was probably for the best, since he was not well liked in the church, since he had voiced thoughts considering if the world really was flat, something the clergy thought very ill of. Nevertheless, it had not made the monastery embargo him. The fact that he was the one who brought most of their wine might have something to do with that, Duarte thought as his subjects returned with the wine.
***
As Duarte returned to his mansion, he sat down at his desk, and begun writing a rapport to his father, but decided to go with the thought he originally had, and ordered his servants to fetch some of his finest wine, which he packed, ordered a servant to send to his father, and called it a day.
Wine (And that's good wine!) is being produced in Bragança!