When the Teetonic Knights invaded Prussia, they didnt find Poles but Old Prussians, a pagan peoples speaking thier own laungauge, the Polish Crown had been unable to conquer these people so what on earth gives Poland the right to claim its thier land, part of Poland, when there were allready another peoples living there who hadnt been conquered.
Well they invaded lands which belonged to Poles i.e. everything west of the river Wisła, including Gdansk.(see map).
And they were holding those land along with land which they took from OLD Prussians. After about 150 years,
civil population under the rule of Teutonic Order rebelled and asked to be part of the Polish Kingdom. In ensuing war only so called Royal Prussia become province of the Crown(see map) - old Polish lands. Also Ermland become part of the Polish Kingdom but as province governed by Bishop.
Teutonic Order remained in the area around Königsberg.
After about 70 years the head of the order Albrecht Hohenzollern changed along with other knights religion. They become Protestants and he become Duke of Prussia. To do that he asked for protection of the Polish King and his uncle.
Thanks to protection of the Polish King the first in history Protestant state was born!
the Duke of Prussia made tribute and swore allegiance to King Sigismund I the Old in the Kraków's market square on 10 April 1525.
He was granted a place in the Senate of the Polish Kingdom,being a part of said Kingdom, however he wasn't interested.
Interesting thought that state which was born thanks to the Polish Kingdom worked hard in later times to destroy said Kingdom and was successful.
Please explain how Prussia could have been legitimately concidered to belong to the Polish Crown, surely it belonged to the original Prussians whom the Knights stole it from?
Is my answer good enough for you?