History of Tunisia for centuries assigned its foundation to a queen of Tyre, Elissa, also called Dido. The Roman historian Pompeius Trogus, a near contemporary of Virgil, describes a sinister web of court intrigue which caused Queen Elissa (Dido) to flee the city of Tyre westward with a fleet of ships. The Roman poet Virgil (70–19 B.C.) portrays Dido as the tragic, admirable heroine of his epic the "Aeneid", which contains many inventions loosely based on legendary history, and includes the story about how the Phoenician queen acquired the Byrsa. By the middle of the sixth century B.C., Carthage had grown into a
DIDO (software) in solving for the costates in optimal control problems. DIDO generates spectrally accurate solutions whose extremality can be verified using Pontryagin's Minimum Principle. Because no knowledge of pseudospectral methods is necessary to use it, DIDO is often used as a fundamental mathematical tool for solving optimal control problems. That is, a solution obtained from DIDO is treated as a candidate solution for the application of Pontryagin's minimum principle as a necessary condition for optimality. DIDO is used world wide in academia, industry and government laboratories. Thanks to NASA, DIDO was flight-proven in 2006. On November 5, 2006, NASA used DIDO