The phrase "were first" can be substituted with a variety of synonyms depending on the context. Some examples include "originated," "pioneered," "inaugurated," "launched," "established," and "initiated." Each of these words connotes the idea of being the first to do or create something. For instance, "pioneered" is often used to describe those who were the first to explore or settle in a new region, while "launched" is commonly used in reference to the introduction of a new product or service. The use of synonyms can add variety and clarity to your writing and help to avoid repetitive language.