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In page Agnes of Bohemia, Duchess of Jawor:

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Elisabeth arranged for Agnes to marry Henry I of Jawor. The wedding took place in 1316, however, because the two were related in the fourth degree of kinship, a papal dispensation was required. It was granted in 1325. Agnes' brother-in-law, King John of Bohemia opposed the marriage, which would make Henry a powerful rival, along with Bolesław III the Generous, the husband of Margaret of Bohemia, a half-sister of Agnes.[citation needed]