Both Dumont and Christophe Cais, co-founder of Albatross Global Solutions, say they believe this trend started after the Sichuan earthquake.

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Archaeologists established that this was the site of the 19th century slave trading complex, the Cais do Valongo, or Valongo Quays.

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Maent wedi sicrhau nawdd gan fanc Barclays, a chyflwynwyd cais i Awdurdod Datblygu Cymru am gymhorthdal dan Gynllun Menter Trefi a Phentrefi Bychain.

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Mae Plaid Cymru yn cefnogi cais gan Nominet i Gorfforaeth y Rhyngrwyd ar gyfer Enwau a Rhifau a Neilltuir (ICANN) am y ddau enw parth lefel-uchaf.

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Yn ei ymateb dywedodd y gweinidog cyllid bod hynny'n effeithio Prydain gyfan a bod llywodraeth y cynulliad wedi gwneud cais i lywodraeth y DU am arian ychwanegol.

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Ailwampio addysg anghenion arbennig yng Nghymru oedd testun y cais.

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Mae Ms Hart yn gobeithio y bydd canlyniad y cais am enwau parth lefel-uchaf yn cael ei ddatgelu cyn diwedd y flwyddyn, er iddi rybuddio y gallai fod yn 2013 cyn i hynny ddigwydd.

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The inscription of Cais do Valongo (Valongo wharf), an important archaeological dig in the centre of Rio de Janeiro, in the World Heritage List of UNESCO was another prominent theme of the seminar, which brought together experts and authorities on black culture and history from Brazil and several countries, most Africans.

UNESCO: Palmares and UNESCO celebrate the results of the international seminar on the memory of slavery | United Nations Educational, Scientific and Cultural Organization