This is the 6888th most frequent Polish word.
galtiera
The word "galtiera" does not appear to have a recognized meaning in Polish. It may be a misspelling or a proper noun.
Here, 'Galtiera' is used as a proper noun, the name of a person, specifically General Galtieri.
Galtiera to był popularny generał.
Galtiera was a popular general.
In this context, 'Galtiera' is again a proper noun in a question form, reflecting inquiry.
Czy wiesz, kto to był Galtiera?
Do you know who Galtiera was?
Here, 'Galtiera' refers to the era or time associated with the person named Galtiera.