Carlo Gesualdo of Venosa (cca 1561 - 1613) was renaissance composer. (Baroque era started in cca 1600 when new composition technique came into practice - basso continuo was invented)
There were many composers of the Baroque period, which lasted from around 1600 to 1750. Some of the prominent composers of this time included, but were not limited to, J.S. Bach, Handel, Vivaldi,...