Few times in history does one person's name turn into an adjective to describe a certain set of characteristics. Casanova is used today to describe a charming, smooth-talking, ladies man, but why? Casanova's skill set and titles made him a true Renaissance man. He was a poet, philosopher, entrepreneur, and even a soldier at one point, so why do we know him almost exclusively as a seducer? The reason for this is also what separates the successful from the exceptional, the millionaires from the billionaires, the people who are widely known when they are alive from the people who are still remembered long after they have died.
Vanguard of a Trait
Casanova was one of the first to popularize the romance genre. Today the genre is huge, as evident from the popularity of the 50 Shades of Grey series, but in Casanova's day, it was taboo to be so revealing in writing. Instead of following the norms, Casanova showed what others had not done before.
Unapologetic for their Unique Traits
Casanova was willing to discuss things others were not willing to reveal. The most successful usually are not the most talented or skilled, they only have more will than others. With this, Casanova does not try to fit a mold that others create, he remains himself and entices others to fit into his.
Unique Traits are remembered
The bulk of Casanova's life and work had nothing to do with seduction, but it is what makes him stands out, and it is what people remember. People are only remembered for their unique traits or what they have done that is different from everyone else. The lesson to take away from this is if you are different, don't try to conform to societal norms (except if it is to the detriment to others).
Casanova was much more than a seducer, but because he was a vanguard of the craft, and he stood out because of this, he is not only remembered in time, but used in modern day vernacular.