A straight-edged sword called the "Notched Blade" was ceremoniously used by new holders of this position. A provision called the rokosz [rok-osh] made rebellion against the holder of this office legal in certain circumstances. Upon accepting this position, the new holder was required to accept the Henrician Articles, which limited his power. Holders of this office were required to be Catholic and their power was further restricted by the Nihil No
A straight-edged sword called the "Notched Blade" was ceremoniously used by new holders of this position. A provision called the rokosz [rok-osh] made rebellion against the holder of this office legal in certain circumstances. Upon accepting this position, the new holder was required to accept the Henrician Articles, which limited his power. Holders of this office were required to be Catholic and their power was further restricted by the Nihil Novi act. It's not a German title, but some of the jewels of this office can be found on display in Dresden, while the rest can currently be viewed in the Wawel [Vavel] Castle. After 1573, holders of this office were elected by an assembly whose members enjoyed the "Golden Liberty" and the liberum veto: the Sejm [seym]. For 10 points, name this royal title held by men such as Stefan Batory and Jan Sobieski. 
A straight-edged sword called the "Notched Blade" was ceremoniously used by new holders of this position.
King of Poland [or King of Poland-Lithuania] 