when was it written?
Mid-4th century
Codex Sinaiticus
 mid-4th century
what is the name of the oldest bible in the world Codex Sinaiticus in which language was it written? Greek
wiki:19603935
Codex Sinaiticus [SEP] Introduction
Codex Sinaiticus (, "Sinaïtikós Kṓdikas"; Shelfmarks and references: London, British Library, Add MS 43725; Gregory-Aland nº א [Aleph] or 01, [Soden δ 2]) or "Sinai Bible" is one of the four great uncial codices, ancient, handwritten copies of a Christian Bible in Greek. The codex is a historical treasure. The codex is an Alexandrian text-type manuscript written in uncial letters on parchment and dated paleographically to the mid-4th century. Scholarship considers the Codex Sinaiticus to be one of the most important Greek texts of the New Testament, along with the Codex Vaticanus. Until Constantin von Tischendorf's discovery of the Sinaiticus text, the Codex Vaticanus was unrivaled.