I WANT THE REACH TO BE ITALY!
I know, i know, i know, I KNOW that most people headcanon France as the Reach but as italian i see at least 8-10 similarities with Italy instead.
Tyrell's colors and features are more stereotypical south Europeans that support the idea of a very warm climate unlike most of France.
The new faith imposed over the pagan ancient rituals is clearly the "Christian one" (God is one in 7 = God is the Thrinity) and the biggest city in Reach becoming THE city of this new religion, where all the knowledges of that religion is preserved, mirrors last centuries of roman empire and the knowledge preserved in Rome.
Old Town being so old that none remember when it was founded and that was already there when Andals arrived recall Rome being "the eternal city" and arrivals of Barbarians that open the "dark age"/middle age.
All this happen in a territory known for a fertil soil since Italy was called "the garden of Europe" by European scholars for it's fertility and some foods from Italy were perceived as exotic and high-quality/class in Middle age north Europe.
This same territory is famous for luxury commerce; even now tourism is just the third most prosperous italian sector, luxury items as high fashion and luxury cars are the first, and even in past italians were famous for clothes.
Early Middle-Age Italy was famous for the Four Marittime Republics and the Reach have a big navy.
Tyrells and Hightower with their schemes and the habits of marry mostly people from inside their territory recalls Borgia and Medici, that rarely married not italian.
Medici and Tyrells share some similarity being both families that weren't originally meant to seat at the table with biggest one : the Tyrells never ruled as kings and originally were among the lower ranking houses of the Reach and just supported their power by marry into higher families, while Medici were originally bankers that heavily intermarriade with high rate local italian nobility to support their raise to the control of the richest city of Italy (Florence) back then. Both families use flowers as coat of arm.
Borgia and Hightowers too share some similarity : both were famous for having some members with very light colors in hair and eyes, unlike the Medici that were mostly brunettes (Ludovico dei Medici was called the Moor for his dark hairs) like Tyrells, both had members that were famously speculated to be involved into dark magic, both married primarily into their local city (Old Town/Rome) high nobility, both had deep ties with the dominant new religion (we had many Borgia as cardinals and popes).
Caterina de Medici and Maria de Medici (aunt and niece) being accused to be unfaithfull and too concerned with Italy's glory and interest over France's ones by French, recalls Cersei vs Olenna and Margaery's beef.
HighGarden was a rich court with great scholars and Italy created the bases for Reinassence in Middle Age, while other european countries experimented Reinassence only in Modern age.
Italians were perceived as sexually promiscuous and "too much into erotic songs/poetries" and Tyrells seems to love literature and sex.
You can call me delulu now, i surely am..but not fully.
The french can have the Lannister.
