There is evidence proving the existence of this region to the Neolithic Age, as attested by the existence of tumuli and dolmens existing here.
The oldest activities and best known of Aveiro, are the one based on the production of Salt and naval trade, this was not an area of maritime tradition, however, the first reference to the city of Aveiro appears only in 959 AD, in reference to the Countess Testament "Mumadona Dias".
The wall of Aveiro, now non-existent as such, was built in the early fifteenth century, a situation which certainly attests to growth and added value that this region had reached with the kingdom.
With their growth, they moved to Aveiro various religious institutions and charitable giving progress and dynamism to this area, surpassing many, many difficult moments.
Some of the most important dates of Aveiro are:
XIII Century - Aveiro was elevated to the rank of town, developing the village around the main church dedicated to St. Miguel (from this temple to be demolished in 1835);
Early fifteenth century - Erection of walls around the urban core;
In 1434, D. Duarte privilege granted to the village to hold a free fair has come to our annual day and is known as Fair in March;
In 1472 - Princess Joan (daughter of Alfonso V), entered the Convent of Jesus (the Museum of Aveiro), died on May 12, 1490, anniversary remembered today at the municipal holiday;
In 1759 - D. Joseph I raised Aveiro city, a few months after he sentenced to the gallows, his last duke, the title created in 1547, by D. John III;
Seventeenth and eighteenth centuries - Siltation of the bar;
1759 - Elevation of Aveiro City;
1808 - Official opening of the bar;
Nineteenth century - gradual demolition of the walls, and part of the stones used in building the piers of the new bar;
In the nineteenth century stands out the active participation of Aveiro in the Liberal Wars.