With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Rhona Mitra is not a songwriter.
text_B: The Turris Mamilia -LRB- `` Mamilian Tower '' -RRB- was a landmark in ancient Rome .. ancient Rome. ancient Rome. It was located in the Subura , a densely populated , notoriously lively quarter of the city .. Subura. Subura. The existence of the tower is attested by an inscription , and it is mentioned by Festus .. inscription. epigraphy. Festus. Sextus Pompeius Festus. The tower , considered by the Romans to be `` very ancient , '' was still standing in the early Imperial era .. Imperial era. Roman Empire. It was thought to have been named after the gens Mamilia , a clan originating in Tusculum who sometimes used the cognomen Turrinus , an adjectival form of turris .. gens Mamilia. Mamilia ( gens ). clan. gens. Tusculum. Tusculum. cognomen. cognomen. adjectival. adjective. Their mythic genealogy claimed descent from Telegonus and Circe .. Telegonus. Telegonus. Circe. Circe. The Mamilian Tower figured in the ritual fight between the Suburaneses , residents of the Subura , and the Sacravienses who lived along the Via Sacra , for possession of the severed head of the October Horse .. Subura. Subura. Via Sacra. Via Sacra. October Horse. October Horse. When the Suburaneses won , the head got to be displayed at the Turris Mamilia ; the rival destination was the Regia , the original residence of the Roman kings .. Regia. Regia. Roman kings. Kings of Rome. The Mamilii are thus assumed to have asserted claims to royal status in the Regal period .. Regal period. Kingdom of Rome. They escaped the traditional odium directed at the Tarquins through unimpeachable service to the Republic .. Tarquins. Tarquins. Republic. Roman Republic. Dumezil claimed that the mock battle represented the Mamilii as traditional enemies of Rome , but this has been criticized as `` an improper emphasis , '' since the potential for an enemy to possess the talisman of the head would result in a bad omen for the state .. Dumezil. Dumezil. state. Roman State. What exactly the tower was is unclear  : perhaps `` a kind of peel-tower . ''. peel-tower. Peel tower
not_related.