What is "the magdeburg centuries"

Century \Cen"tu*ry\, n.; pl. Centuries. [L. centuria (in senses 1 & 3), fr. centum a hundred: cf. F. centurie. See Cent.]

1. A hundred; as, a century of sonnets; an aggregate of a hundred things. [Archaic.]

   And on it said a century of prayers.
   --Shak.

2. A period of a hundred years; as, this event took place over two centuries ago.

   Note: Century, in the reckoning of time, although often used in a general way of any series of hundred consecutive years (as, a century of temperance work), usually signifies a division of the Christian era, consisting of a period of one hundred years ending with the hundredth year from which it is named; as, the first century ( a. d. 1-100 inclusive); the seventh century ( a. d. 601-700); the eighteenth century ( a. d. 1701-1800). With words or phrases connecting it with some other system of chronology it is used of similar division of those eras; as, the first century of Rome (A.U.C. 1-100).

3. (Rom. Antiq.)

   1. A division of the Roman people formed according to their property, for the purpose of voting for civil officers.

   2. One of sixty companies into which a legion of the army was divided. It was Commanded by a centurion.

      Century plant (Bot.), the Agave Americana, formerly supposed to flower but once in a century; -- hence the name. See Agave.

      The Magdeburg Centuries, an ecclesiastical history of the first thirteen centuries, arranged in thirteen volumes, compiled in the 16th century by Protestant scholars at Magdeburg.