《资治通鉴·陈纪·陈纪九》
直到即位称帝后，才找到舅舅的儿子吕永吉，于是追赠外祖父吕双周为太尉，封齐郡公，让吕永吉承袭爵位。
及即位，始求得舅子吕永吉，追赠外祖双周为太尉，封齐郡公，以永吉袭爵。
Only after he ascended to the throne did he find his maternal uncle's son, Lu Yongji, and posthumously awarded his maternal grandfather, Lu Shuangzhou, the title of Grand Marshal and the title of Duke of Qi Jun, which Lu Yongji inherited.
<s>[INST] 请提供这段文言文的现代汉语解释: 及即位，始求得舅子吕永吉，追赠外祖双周为太尉，封齐郡公，以永吉袭爵。 [/INST] 直到即位称帝后，才找到舅舅的儿子吕永吉，于是追赠外祖父吕双周为太尉，封齐郡公，让吕永吉承袭爵位。</s>
请提供这段文言文的现代汉语解释: 及即位，始求得舅子吕永吉，追赠外祖双周为太尉，封齐郡公，以永吉袭爵。
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直到即位称帝后，才找到舅舅的儿子吕永吉，于是追赠外祖父吕双周为太尉，封齐郡公，让吕永吉承袭爵位。
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