Upvote:-1
If I remember correctly, when it was first claimed (to legitimize the Hundred year war), France neighbor were quite happy with the fact, the Holy Roman Empire sided with the "legitimate" king of France (at first, his son famously fought at Crécy). Years later, Charles V of Hapsburg, sided with François I to make the English crown abdicate the french claim because heresy and stuff like that(he was unsuccessful, and despised François I, he just hated the Tudor king much more, but that is another story.).
Austria, Poland/Lithuania and the Ottoman Empire didn't really care, but do note that the Ottoman Empire was an ally of the French crown during Louis XIV's reign, they might have dismissed the validity of the English claim while allied.
Upvote:16
How did other countries take/recognise this title (the largest/most important, like Spain, Holy Roman Empire, Austria, Poland/Lithuania, the Pope, Ottoman Empire maybe)?
Was it just taken "it's just a children's play, let the English perform it, if it's fun for them"?
All the other monarchs did the same thing.
The kings of France and Spain both used the title of King of Navarre.
At one point Emperor Charles VI claimed so many kingdoms that by coincidence two which were hundreds of miles apart had the same name in English - Galicia in Spain and Galicia in Poland - Lithuania.
The king of the Spanish kingdoms was king of both Sicilies because his ancestors acquired both rival kingdoms of Sicily. And other rulers also used the title King of Sicily.
The King of Denmark and Norway, and the King of Sweden both used the titles of King of the Goths and of the Wends.
The king of Hungary and the Tsar of Russia both listed Bulgaria among their titles, and in the 19th century the king of Bulgaria also used the title.
Similarly, there was period when the King of Hungary and the king of Serbia both used the title king of Serbia.
And several monarchs at at a time claimed the title of King of Jerusalem.