This thesis's aim is to lay out the image of the Roman festivals along with their pertaining rituals. Among the other related things, it also presents diverse sacrifices offered to gods, mainly throughout the examples from the first and the second book of Fasti by the roman poet Publius Ovidius Naso. Ancient Romans were in general seen as a very religiously devoted people, having in mind their polytheistic religion and a very complex religious beliefs and rituals. Fasti is one of the most distinctive pieces of Roman literature. It contains six volumes (each dedicated to a certain month of the year) through which Ovid presents The Roman calendar 'day-by-day', describing related rituals. This piece is so distinctive because the poet combines different genres: mythology, history, philosophy, epic stories, conversation with gods, comic scenes and writes it down in an elegiac couplet. Fasti introduces us with a special devotion of Romans to a god named Ianus Biformis. It is the god of the beginnings, so they used to devote the first day of the year to him as well as the Agonalia festivity, when they used to sacrifice lambs. During the following festival of Agonaia, they used to celebrate the honor of the goddess and prophetess Carmena, a rearguard of pregnant women and labor which made her day very special to Romans. On the February 15th Romans used to celebrate Lupercalia, dedicated to Faunus – god of the forrest. During the celebration, priests would run around the streets naked, whipping women to cure their infertility, as they believed. After Quirinalia (for which Ovidius as well as his contemporaries believed to celebrate the conversion of Romulus into a god) and Fornacalia on February 17th (dedicated to goddess Fornax to make sure furnaces would function properly while preparing their breads and cakes) the following celebrations were Parentalia and Feralia (dedicated to deceased family members) and Caristia (dedicated to a living family members). The end of the February and also the end of the second volume was left to describe Terminalia - celebration of god Termin, during which neighbors would bury down their warrior hatchets and together sacrifice a lamb or suckling pig.