Question: Who is the mother of the leader who made the empire that Roman Britain was part of reach its greatest extent?

<P0-S0> The imperial period of Rome lasted approximately 1,500 years compared to the 500 years of the Republican era. <P0-S1> The first two centuries of the empire's existence were a period of unprecedented political stability and prosperity known as the Pax Romana, or ``Roman Peace ''. <P0-S2> Following Octavian's victory, the size of the empire was dramatically increased. <P0-S3> After the assassination of Caligula in AD 41, the Senate briefly considered restoring the republic, but the Praetorian Guard proclaimed Claudius emperor instead. <P0-S4> Under Claudius, the empire invaded Britannia, its first major expansion since Augustus. <P0-S5> After Claudius' successor, Nero, committed suicide in AD 68, the empire suffered a series of brief civil wars, as well as a concurrent major rebellion in Judea, during which four different legionary generals were proclaimed emperor. <P0-S6> Vespasian emerged triumphant in AD 69, establishing the Flavian dynasty, before being succeeded by his son Titus, who opened the Colosseum shortly after the eruption of Mount Vesuvius. <P0-S7> His short reign was followed by the long reign of his brother Domitian, who was eventually assassinated. <P0-S8> The Senate then appointed the first of the Five Good Emperors. <P0-S9> The empire reached its greatest extent under Trajan, the second in this line. <SEP> <P1-S0> Marcus Ulpius Traianus was born on 18 September 53AD in the Roman province of Hispania Baetica (in what is now Andalusia in modern Spain), in the city of Italica (now in the municipal area of Santiponce, in the outskirts of Seville). <P1-S1> Although frequently designated the first provincial emperor, and dismissed by later writers such as Cassius Dio (himself of provincial origin) as "an Iberian, and neither an Italian nor even an Italiot", Trajan appears to have hailed on his father's side from the area of Tuder (modern Todi) in Umbria, at the border with Etruria, and on his mother's side from the Gens Marcia, of an Italic family of Sabine origin. <P1-S2> Trajan's birthplace of Italica was founded as a Roman military colony of "Italian" settlers in 206BC, though it is unknown when the Ulpii arrived there. <P1-S3> It is possible, but cannot be substantiated, that Trajan's ancestors married local women and lost their citizenship at some point, but they certainly recovered their status when the city became a municipium with Latin citizenship in the mid-1st century BC. <SEP> <P2-S0> the church of england (c of e) is the established church of england. <P2-S1> the archbishop of canterbury is the most senior cleric, although the monarch is the supreme governor. <P2-S2> the church of england is also the mother church of the international anglican communion. <P2-S3> it traces its history to the christian church recorded as existing in the roman province of britain by the third century, and to the 6th - century gregorian mission to kent led by augustine of canterbury. <SEP> <P3-S0> Dogs of Roman Britain refers to the use of dogs in the Roman Empire from the Province of Brittania under Roman rule. <SEP> <P4-S0> mother country: britain, the welfare state, and nuclear pollution (1989) is a work of nonfiction by marilynne robinson that tells the story of sellafield, a government nuclear reprocessing plant located on the coast of the irish sea. <P4-S1> the book shows how the closest village to sellafield suffers from death and disease due to decades of waste and radiation from the plant. <P4-S2> "mother country" was a national book award finalist for nonfiction in 1989. while on sabbatical in england, robinson's interest in the environmental ramifications of the plant began when she discovered a newspaper article detailing its hazards.