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John I, Duke of Brunswick-Grubenhagen
John I
,
Duke
of
Brunswick-Grubenhagen
was
provost
of the
St
.
Alexandri
Minster
in
Einbeck
.
He was the son of Duke
Henry I "the Marvelous"
of Brunswick-Grubenhagen and his
wife
Agnes of Meissen
,
daughter
of
Margrave
Albert II of Meissen
.
