Question: during what ancient dynasty was there an Egyptian vizier under king Mentuhotep II ?

text: List of ancient Egyptians
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This is a list of ancient Egyptian people who have articles on Wikipedia. The list covers key ancient Egyptian individuals from the start of the first dynasty until the end of the ancient Egyptian nation when the Ptolemaic Dynasty ended and Egypt became a province of Rome in 30 BC. Note that the dates given are approximate. The list presented below is based on the conventional chronology of Ancient Egypt, mostly based on the Digital Egypt for Universities database developed by the Petrie Museum of Egyptian Archaeology. A - 
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Name Main Title Dynasty Date Comment
Babaef Vizier 4th dynasty ( fl . c. 26th century BC ) Also known as Khnumbaf . He was a vizier during the reign of king Shepseskaf . He was probably the son of the vizier Duaenre
Bakenkhonsu High Priest of Amun 19th dynasty ( c. 1303 BC - c. 1213 BC ) From the time of pharaoh Ramesses II
Bakenranef Pharaoh 24th dynasty ( reigned 725 BC - 720 BC ) Also known as Bocchoris . Was briefly a king of the 24th dynasty of Egypt . Based at Sais in the western Delta . Captured and executed by Shabaka , a king of the 25th dynasty
Bakenrenef Vizier 26th dynasty ( 7th century BCE ) From the time of pharaoh Psamtik I
Baketwernel Queen 20th dynasty ( fl . c. late-12th century BC ) Great Royal Wife of Ramesses IX
Baqet III Nomarch of Men'at Khufu 11th dynasty ( fl . c. 21st century BCE ) From the time of pharaoh Mentuhotep II
Baskakeren King of Kush  ( fl . c. late-5th century BC ) King of Kush ( reigned c. 405 BC - c. 404 BC ) and was probably a son of King Malewiebamani and the younger brother of King Amanineteyerike . He succeeded Amanineteyerike to the throne
Baufra Prince 4th dynasty ( fl . c. 26th century BC ) Also known as Baufre or Bauefre . Baufra was a son of Pharaoh Khufu
Bay Irsu Chancellor 19th dynasty ( fl . c. late-13th century BC ) Served under pharaoh Seti II and later became an influential powerbroker in the closing stages of the 19th dynasty . Executed
Bebi Vizier 11th dynasty fl . c. 21st century BC Egyptian vizier under king Mentuhotep II
Bebiankh Pharaoh 16th dynasty fl . c. early-16th century BC Also known as Seuserenre Bebiankh . The successor of king Semenre
Bebnum Pharaoh 14th or 16th dynasty fl . c. early to mid 17th century BC Obscur ruler of Lower or Upper Egypt during the Second Intermediate Period . Only known from the Turin King List
Behenu Queen 6th dynasty fl . c. 23rd century BC She is thought to have been the wife of either Pepi I or of Pepi II
Bek ( or Bak ) Royal Sculptor 18th dynasty fl . c. mid-14th century BC Chief royal sculptor during the reign of Pharaoh Akhenaten . Bek followed the king to Akhetaten , the city founded by Akhenaten . He oversaw the construction of the great temple statues of the king
Beketamun Princess 18th dynasty ( fl . c. mid-15th century BC ) Also known as Beket . A daughter of Pharaoh Thutmose III
Beketaten Princess 18th dynasty ( fl . c. mid-14th century BC ) She was the youngest daughter of Pharaoh Amenhotep III and Tiye and thus the sister of Pharaoh Akhenaten
Benerib Queen 1st dynasty ( fl . 31st century BC ) Benerib was most likely a wife of pharaoh Hor-Aha , but she was not the mother of his heir , Djer
Berenice Princess/Queen Ptolemaic ( fl . 261 BC - 246 BC ) Also known as Berenice Syra . Daughter of the Egyptian king Ptolemy II Philadelphus and Arsinoe I . She married the Seleucid monarch Antiochus II Theos who divorced his wife , Laodice I . When Antiochus II died , Berenice claimed the regency for her son , Seleucus . However , both Berenice and her son were then killed by Laodice I
Berenice I Queen Ptolemaic ( c. 340 BC - c. 275 BC ) A Macedonian noblewoman who , through her marriage to Ptolemy I Soter , became the first queen of the Ptolemaic dynasty of Egypt . Berenice travelled to Egypt as a lady-in-waiting to Eurydice , Ptolemy I 's wife . Ptolemy I married Berenice in 317 BC
Berenice II Queen Ptolemaic ( c. 267 BC - c. 221 BC ) The daughter of Magas of Cyrene and Queen Apama II . Her husband , Demetrius the Fair , a Macedonian prince , moved to Cyrene where he became the lover of her mother Apama . So Berenice had him killed in Apama 's bedroom . Afterwards she married the Egyptian king , Ptolemy III Euergetes