 <translate> To answer this question, we should know that: Queen Elizabeth II became the longest-reigning British monarch on 9 September 2015 when she surpassed the reign of her great-great-grandmother Victoria. The answer is Queen Elizabeth II. <yor> Láti dáhùn ìbéèrè yìí, a gbọ́dọ̀ mọ̀ pé: Ọbabìnrin Elizabeth Kejì di ọba ilẹ̀ Gẹ̀ẹ́sì tó pẹ́ jùlọ lórí oyè ní ọjọ́ kẹsàn án oṣù kẹsàn án ọdún 2015 nígbà tó lé ìjọba Victoria ìyá-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ-ọmọ. Ìdáhùn náà ni Ọbabìnrin Elizabeth Kejì. 