The article is already a GA, so I'll treat this as an A-class review.
- consider increasing the density of references to ensure all sentences are cited;
- consider providing translations of titles for foreign languages references;
- please add "p." to page numbers in references;
- regarding the "Instytut Historii (Polska Akademia Nauk) (2004). Acta Poloniae historica, Issues 89–90. Zakład Narodowy im. Ossolińskich" ref, if I am not mistaken, it is a reprint / colletion of academic articles. Try to identify the relevant article and author;
- The article are referencing Jan Długosz twice. He is very much a primary source, a secondary source would be preferred;
- sections on issue and ancestry are unreferenced, ditto for the note;
- Vladislaus, Jogaila. The name of this king is a bit controversial; I'd suggest using Władysław instead of Vladislaus, an on the first use, note the Polish spelling of Jagiełło (Jogaila is Lithuanian);
- the article does a good job with ilinks, but all castles are notable, and not all are linked here, please ensure they have links;
- please try to remove the see also section, both links should be incorporated in text;
- Polish wiki notes one tidbit not mentioned here: that she used the title of Queen of Poland, and implies it was at least a bit controversial. Perhaps the article could be expanded to discuss this.
--Piotr Konieczny aka Prokonsul Piotrus| reply here 11:54, 10 July 2012 (UTC)