《汉书·传·魏豹田儋韩王信传》
原六国时齐王田建的孙子田安，因在项羽渡河援救赵时，攻克了济北的几个城邑，并带领军队投奔项羽，故项羽立田安为济北王，定都博阳。
故齐王建孙田安，项羽方渡河救赵，安下济北数城，引兵降项羽，羽立安为济北王，治博阳。
Tian An, the grandson of King Tian Jian of Qi during the Warring States period, attacked several cities in Jinan when Xiang Yu crossed the river to rescue Zhao, and led the army to surrender to Xiang Yu. Xiang Yu appointed Tian An as Prince of Jinan, with his capital in Boyang.
<s>[INST] Kindly elucidate the central themes in this passage in English: 故齐王建孙田安，项羽方渡河救赵，安下济北数城，引兵降项羽，羽立安为济北王，治博阳。 [/INST] Tian An, the grandson of King Tian Jian of Qi during the Warring States period, attacked several cities in Jinan when Xiang Yu crossed the river to rescue Zhao, and led the army to surrender to Xiang Yu. Xiang Yu appointed Tian An as Prince of Jinan, with his capital in Boyang.</s>
Kindly elucidate the central themes in this passage in English: 故齐王建孙田安，项羽方渡河救赵，安下济北数城，引兵降项羽，羽立安为济北王，治博阳。
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Tian An, the grandson of King Tian Jian of Qi during the Warring States period, attacked several cities in Jinan when Xiang Yu crossed the river to rescue Zhao, and led the army to surrender to Xiang Yu. Xiang Yu appointed Tian An as Prince of Jinan, with his capital in Boyang.
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