The termination -olt would be but a corruption of the Latin adjective altum into oltum, so Gazoldo etymologically would mean "high banished forest," an active economic center of self-sufficient production.

According to Navarrini, the hypothesis of Gazoldo's Germanic origin leads to the assumption of a permanence in the territory of a Lombard ethnic substratum that maintained its customs and traditions, which would explain the land-lord relationship around the 10th–11th centuries.

[7] The beginning of a jurisdictional autonomy of the territory can presumably be placed chronologically around the middle of the 10th century, when the weakening of the central power due to the existing rivalry between the pretenders to the Regnum Italiae, the direct descent from the Carolingians having disappeared, the gradual disenfranchisement of the count in the comital districts, a consequence of the alienations of state endowments in favor of bishops and cities, and the invasion of the Hungarians, which caused the encastellation of many towns in the countryside, are reasons for the decay of the ancient forms of public organization and the change towards new territorial units.

[8] Gazoldo, in the oldest document in which it is first mentioned, is said to belong to the Mantuan territory; this can be read in the Liber Potheris of the municipality of Brescia, in which relatively to the year 1215 twice funds lying ad Gazoltum in Mantuana are described.

[9] The Liber Potheris of Brescia represents a valuable testimony to the politico-military action of the city communes against the rural potentates, aimed at the progressive elimination of any remaining center of power and the full establishment of communal hegemony over the territory.

Recorded in the Liber Potheris are the pacts and transactions through which the rural lords gradually became conglobated in city society, just as with a similar action happened in the Mantuan territory, where, however, the phenomenon had less conspicuous forms.

[10] A legally unspecifiable relationship, but one that can be framed in the powers of lordship exercised pro indiviso in the territory of the so-called "Committee," to which Gazoldo too, albeit partially, would seem to have access.

To summarize, the first historical information about Gazoldo thus dates back to the beginning of the 13th century, in an act of verification of the feudal possessions of the commune of Brescia in the neighboring curiae comitali of Mariana Mantovana and Redondesco.