From Wikipedia:Naming conventions (royalty and nobility):
- These following conventions apply to European monarchs since the fall of the Roman Empire..., because they share much the same stock of names. Hence, they also apply to Polish monarchs.
- If a monarch or prince is overwhelmingly known, in English, by a cognomen, it may be used, and there is then no need to disambiguate by adding Country. Since cognomina of Polish monarchs are not well known in English, this exception does not apply to Poland.
- Pre-emptively disambiguate the names of kings, queens regnant,... in the format "{Monarch's first name and ordinal} of {Country}", omitting the royal or imperial titles... This is an exception to the general rule of most common English name. Nevertheless, Monarch's first name and Country should both be the most common form used in current English works of general reference. Where this cannot be determined, use the conventional anglicized form of the name... Except for a few early monarchs of the House of Piast, Polish monarchs had Christian names with well established English equivalents.
- Where a monarch has reigned over a number of states, use the most commonly associated ordinal and state. This applies not only to Polish monarchs who also reigned outside Poland (e.g. Wenceslaus II of Bohemia, Henry III of France), but also to high dukes of Poland of the fragmentation era who are better known as monarchs of their local, hereditary duchies (e.g. Conrad of Masovia).
- European monarchs whose rank was below that of King..., should be at the location "{Monarch's first name and ordinal}, {Title} of {Country}". This applies to all those Polish monarchs who held a ducal title, but were never crowned as kings.
- No family or middle names, except where English speakers normally use them. This also applies to kings who are popularly known by two given names (e.g. John I of Poland, not John Albert of Poland) and to elective kings who are popularly known by their family names (e.g. John III of Poland, not John Sobieski).
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Current title
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Where it should be
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Mieszko I of Poland
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Mieszko I, Duke of Poland
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Bolesław I Chrobry
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Boleslaus I of Poland
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Mieszko II Lambert
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Mieszko II of Poland
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Casimir I the Restorer
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Casimir I, Duke of Poland
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Bolesław II the Bold
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Boleslaus II of Poland
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Władysław I Herman
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Vladislaus I, Duke of Poland
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Zbigniew of Poland
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Zbigniew, Duke of Poland
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Bolesław III Wrymouth
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Boleslaus III, Duke of Poland
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Władysław II the Exile
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Vladislaus II, Duke of Poland
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Bolesław IV the Curly
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Boleslaus IV, Duke of Poland
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Mieszko III the Old
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Mieszko III, Duke of Poland
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Casimir II the Just
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Casimir II, Duke of Poland
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Leszek I the White
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Leszek I, Duke of Poland
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Władysław III Spindleshanks
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Vladislaus III, Duke of Poland
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Mieszko I Tanglefoot
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Mieszko I, Duke of Silesia
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Konrad I of Masovia
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Conrad, Duke of Masovia
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Henry I the Bearded
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Henry I, Duke of Silesia
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Henry II the Pious
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Henry II, Duke of Silesia
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Bolesław V the Chaste
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Boleslaus V, Duke of Poland
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Leszek II the Black
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Leszek II, Duke of Poland
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Henry IV Probus
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Henry IV, Duke of Silesia
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Przemysł II
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Przemysł of Poland
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Wenceslaus II of Bohemia
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Wenceslaus II of Bohemia
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Władysław I the Elbow-high
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Vladislaus I of Poland
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Casimir III the Great
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Casimir III of Poland
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Louis I of Hungary
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Louis I of Hungary
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Jadwiga of Poland
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Hedwig of Poland
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Jogaila
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Vladislaus II of Poland
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Władysław III of Poland
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Vladislaus III of Poland
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Casimir IV Jagiellon
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Casimir IV of Poland
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John I Albert of Poland
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John I of Poland
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Alexander Jagiellon
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Alexander of Poland
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Sigismund I the Old
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Sigismund I of Poland
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Sigismund II Augustus
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Sigismund II of Poland
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Henry III of France
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Henry III of France
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Anna the Jagiellonian
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Anna of Poland
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Stephen Báthory of Poland
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Stephen of Poland
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Sigismund III Vasa
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Sigismund III of Poland
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Władysław IV Vasa
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Vladislaus IV of Poland
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John II Casimir Vasa
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John II of Poland
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Michael Korybut Wiśniowiecki
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Michael of Poland
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John III Sobieski
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John III of Poland
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Augustus II the Strong
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Augustus II of Poland
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Stanisław Leszczyński
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Stanislaus I of Poland
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Augustus III of Poland
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Augustus III of Poland
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Stanisław August Poniatowski
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Stanislaus II of Poland
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