Trolleybuses in Plovdiv Trolleybuses in Plovdiv The Plovdiv trolleybus system () was a part of the public transport network of the city and municipality of Plovdiv, the second most populous city in Bulgaria. Opened in December 1955, the system had waxed and waned in size over time. As of the beginning of 2012, it was made up of only one route. There are current disputes between the operator and the municipality regarding the validity of the trolleybus contract. Gradski Transport Plovdiv is still the operator of this type of transport, despite the numerous infractions of the contract since 2010. In October 2012, because
History of Plovdiv BC, Plovdiv was conquered by Philip II of Macedon, the father of Alexander the Great, who renamed it "Φιλιππόπολις", "Philippopolis" or "the city of Philip" in his own honour. Later, it was reconquered by the Thracians who called it "Pulpudeva" (from Philipopolis). In 72 BC, Plovdiv was seized by the Roman general Terentius Varo Luculus. The city was incorporated into the Roman Empire, where it was called "Trimontium" ("City of Three Hills") and served as capital of the province of Thrace. Thrimontium was an important crossroad for the Roman Empire and was called "The largest and most beautiful of all