en.wikipedia.org/wiki/Edward_the_Black_Prince

The article is discussing the immediate causes of the Hundred Years’ War in the 1330s. By then, Philip IV had been dead for more than two decades; he died in 1314. The French king confronting Edward III in this period was Philip VI (reigned 1328–1350).

Reliable histories of the war describe Edward III’s dispute as being with Philip VI over feudal rights/homage for Gascony:

• World History Encyclopedia states that the war began when Edward III “squabbled with Philip VI of France … over feudal rights concerning Gascony.”
• HistoryExtra likewise says that Edward III “owed homage to Philip VI.”

So the clause should refer to obligations owed to Philip VI of France, not Philip IV.

This bullet overstates the story and appears to reverse the usual description of the gem’s provenance.

Authoritative references describe the stone as given to Edward after Nájera, not as something he forced Peter of Castile to surrender:

• Britannica says the stone “was given” to Edward by Pedro of Castile after the victory of Nájera.
• Historic Royal Palaces says Pedro “gave it” to Edward in 1367 “as a reward for helping him defeat a rival in battle.”
• Another Britannica entry goes further and says the stone “may or may not have been given to him,” which shows the provenance is at least partly traditional/uncertain.

So the problem is twofold: (1) the standard story is that the gem was given as a reward or gift, not extorted by Edward, and (2) even that story is sometimes presented as legendary or uncertain. The phrase “forced … to give” is therefore not supported by the usual historical references.