Question: Who is the mother of the person under whom the empire where Irene Doukaina was a citizen reached its greatest extent?

<P0-S0> in 1729, nader shah, a chieftain and military genius from khorasan, successfully drove out and conquered the pashtun invaders. <P0-S1> he subsequently took back the annexed caucasian territories which were divided among the ottoman and russian authorities by the ongoing chaos in iran. <P0-S2> during the reign of nader shah, iran reached its greatest extent since the sassanid empire, reestablishing the iranian hegemony all over the caucasus, as well as other major parts of the west and central asia, and briefly possessing what was arguably the most powerful empire at the time. <SEP> <P1-S0> John has been assessed as the greatest of the Komnenian emperors. <P1-S1> In the course of his twenty-five year reign, John made alliances with the Holy Roman Empire in the west, decisively defeated the Pechenegs, Hungarians and Serbs in the Balkans, and personally led numerous campaigns against the Turks in Asia Minor. <P1-S2> John's campaigns fundamentally changed the balance of power in the east, forcing the Turks onto the defensive and restoring to the Byzantines many towns, fortresses and cities right across the Anatolian peninsula. <P1-S3> In the southeast, John extended Byzantine control from the Maeander in the west all the way to Cilicia and Tarsus in the east. <P1-S4> In an effort to demonstrate the Byzantine ideal of the emperor's role as the leader of the Christian world, John marched into Muslim Syria at the head of the combined forces of Byzantium and the Crusader states; yet despite the great vigour with which he pressed the campaign, John's hopes were disappointed by the evasiveness of his Crusader allies and their reluctance to fight alongside his forces. <SEP> <P2-S0> queen are one of the most bootlegged bands ever, according to nick weymouth, who manages the band's official website. <P2-S1> a 2001 survey discovered the existence of 12,225 websites dedicated to queen bootlegs, the highest number for any band. <P2-S2> bootleg recordings have contributed to the band's popularity in certain countries where western music is censored, such as iran. <P2-S3> in a project called queen: the top 100 bootlegs, many of these have been made officially available to download for a nominal fee from queen's website, with profits going to the mercury phoenix trust. <P2-S4> rolling stone ranked queen at number 52 on its list of the "100 greatest artists of all time", while ranking mercury the 18th greatest singer, and may the twenty-sixth greatest guitarist. <P2-S5> queen were named 13th on vh1's 100 greatest artists of hard rock list, and in 2010 were ranked 17th on vh1's 100 greatest artists of all time list. <P2-S6> in 2012, gigwise readers named queen the best band of past 60 years. <SEP> <P3-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). <P3-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. <P3-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. <P3-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> <P4-S0> The imperial period of Rome lasted approximately 1,500 years compared to the 500 years of the Republican era. <P4-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 ''. <P4-S2> Following Octavian's victory, the size of the empire was dramatically increased. <P4-S3> After the assassination of Caligula in AD 41, the Senate briefly considered restoring the republic, but the Praetorian Guard proclaimed Claudius emperor instead. <P4-S4> Under Claudius, the empire invaded Britannia, its first major expansion since Augustus. <P4-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. <P4-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. <P4-S7> His short reign was followed by the long reign of his brother Domitian, who was eventually assassinated. <P4-S8> The Senate then appointed the first of the Five Good Emperors. <P4-S9> The empire reached its greatest extent under Trajan, the second in this line.