There are many different recipes and many different stories as how and where the sangria was originated. Most people believe sangria was created in mediterranean Spain by farmers who on a hot day after working the fields wanted to use their produce, wine & fruits, and use it to drink in a way that will refresh and kill the thirst of a hot summer day. It's name originates from blood or sangre in spanish due to it's ruby colour. Sangre - Sangria. Makes sense to me however others believe that sangria comes from a refreshing drink during XVIII in the the french & english Antilles call sangaree or sang-gris.
It's history might not be clear but what it's for sure it's that sangria is today Spanish Natinal Drink.
Differnet people will do sangria in many different ways using all sorts of fruits, spirits ... many variations exist. To me what is important is that you make your own sangria from the scratch and from fresh ingredients. So this is how I like it:
To make a 1L Jug of Sangria:
Use some cheap but medium to full body fruity red wine. Tempranillo is spanish grape of excellence but here in Australia I discover Slippery Fish and this wine it's cheap and makes great sangria. It can be purchase at any 1st Liquor