Lucius Tarutius Firmanus
Who was Lucius Tarutius Firmanus?
Astrologer, astronomer and mathematician
Biographical data adapted from Wikipedia’s article on Lucius Tarutius Firmanus (CC BY-SA 4.0).
Biography
Lucius Tarutius Firmanus, also known as Lucius Tarutius of Firmum, was a Roman philosopher, mathematician, and astrologer who flourished around 86 BC. Born in Fermo (ancient Firmum) in the Marche region of central Italy, he became one of the most noted practitioners of astrological and astronomical calculation in the late Roman Republic. Though the precise dates of his birth and death remain unknown, his intellectual contributions and personal associations with leading Roman thinkers of his day secured his place in the historical record.
Tarutius was a close friend of two of Rome's most eminent intellectual figures, Marcus Terentius Varro and Marcus Tullius Cicero. This circle of association placed him at the heart of Roman scholarly life during a turbulent political era. Varro, himself a polymath of extraordinary range, recognized in Tarutius a uniquely skilled practitioner capable of applying rigorous mathematical and astrological methods to problems of historical reconstruction. Cicero, while personally skeptical of divination, nevertheless acknowledged Tarutius in his writings, notably in De Divinatione, indicating the degree to which Tarutius was taken seriously as a learned man.
The most celebrated of Tarutius's undertakings was his astrological reconstruction of the life of Romulus, the legendary founder of Rome, undertaken at Varro's specific request. Working backward from accounts of Romulus's life, death, and the founding of the city, Tarutius applied the principles of genethlialogy, the branch of astrology concerned with birth charts, to determine when Romulus must have been born. He concluded that Romulus was born on March 24 in the second year of the second Olympiad, corresponding to approximately 771 BC. To arrive at this date, Tarutius employed calculations that required translating dates from the Egyptian calendar, demonstrating considerable technical facility across different chronological systems.
Tarutius also calculated that the city of Rome itself was founded on October 4, 754 BC, between the second and third hour of the day. This figure was derived by reasoning that a city, like a person, could be assigned a natal horoscope based on its moment of establishment. Plutarch, in his Life of Romulus, and Cicero both reference these calculations, preserving them for later centuries. The proximity of the calculated founding date to a known solar eclipse drew the attention of the Renaissance scholar Joseph Justus Scaliger, who discussed the matter in detail, indicating the longevity of interest in Tarutius's work among later chronologists and astronomers.
Beyond his astrological work, Tarutius is credited in ancient sources as a mathematician and philosopher, though the specific nature of his philosophical writings has not survived. His methodology in the Romulus horoscope project reflects an approach that blended astronomical observation, mathematical computation, and the interpretive frameworks of Hellenistic astrology, which had by his era become deeply embedded in Roman intellectual culture. His name has been preserved across centuries not only in classical texts but in modern planetary nomenclature, with the lunar crater Taruntius named in his honor.
Before Fame
The details of Tarutius's early life are not recorded in surviving ancient sources. He was born in Firmum, a Roman colony on the Adriatic coast of central Italy, a town with strong ties to Roman civic and military culture. The intellectual environment of the late Roman Republic was one in which Greek learning, particularly in philosophy, mathematics, and astronomy, had been thoroughly absorbed into Roman educated life. By the second and first centuries BC, Hellenistic astrology had gained wide acceptance among Roman elites, and practitioners who combined mathematical rigor with astrological interpretation were valued in aristocratic and scholarly circles.
Tarutius likely received an education steeped in both Roman and Greek traditions, acquiring fluency in the mathematical and astronomical disciplines that underpinned serious astrological work of the period. His friendships with Varro and Cicero suggest that he moved in the highest intellectual circles of his day, and his expertise was recognized as sufficiently exceptional to be entrusted with a task as historically and symbolically significant as reconstructing the horoscope of Rome's legendary founder.
Key Achievements
- Reconstructed the natal horoscope of Romulus, calculating his birth date as March 24, 771 BC, using retrograde astrological and astronomical methods
- Determined the precise founding date of Rome as October 4, 754 BC, by applying astrological natal chart principles to the city's establishment
- Employed cross-calendar computation, converting between the Egyptian calendar and the Greek Olympiad system, to achieve historical date calculations
- Maintained close scholarly relationships with both Varro and Cicero, placing him among the foremost intellectuals of the late Roman Republic
- Earned posthumous recognition in modern astronomy through the naming of the lunar crater Taruntius in his honor
Did You Know?
- 01.Tarutius calculated the exact hour of Rome's founding as occurring between the second and third hour of the day on October 4, 754 BC, treating the city itself as having a natal horoscope.
- 02.His calculation of Romulus's birth date required converting between the Egyptian calendar and the Greek Olympiad dating system, reflecting mastery of multiple ancient chronological frameworks.
- 03.The lunar impact crater Taruntius, located on the near side of the Moon, is named in his honor, giving a first-century BC Roman astrologer a permanent presence in modern astronomical nomenclature.
- 04.Renaissance scholar Joseph Justus Scaliger specifically examined Tarutius's founding date for Rome in connection with eclipse records, showing the work remained scientifically relevant more than 1,600 years after it was produced.
- 05.Cicero, who was deeply skeptical of astrology as a discipline, nonetheless mentioned Tarutius by name in De Divinatione, a distinction that reflects Tarutius's standing even among critics of astrological practice.