was
The word 'era' is the past tense of the verb 'essere', which means 'to be' in English. It is used to describe past states, conditions, or situations. For example, 'Era bella' means 'She was beautiful.' Note that 'era' is used for both singular masculine and feminine subjects, unlike the present tense of 'essere'.
It was a hot summer day.
In this sense, 'Era' is used to set the context or environment of a particular event or situation in the past.
My father was a famous painter.
Here, 'Era' is used to describe a past state or condition, specifically one that no longer holds true.
The modern era began in the 20th century.
In this example, 'Era' is a noun that refers to a distinct period of history.