Indeed the Loire has been the home of Kings since the 10th century. The monarchy of France ruled in the Loire Valley for several centuries, until the French Revolution, and as a result it was baptised "The Valley of Kings", or "The Valley of a thousand Chateaux".
There are several reasons for the King's and Queen's passion for the Loire:
This royal, but capricious river, was a major transport axis until the 19th century. Aboard their toues, gabares, and futreaux, the Loire mariners ensured the supply, from town to town, of wine, fruit, salt, cereals and regional building materials, like slate and tuffeau for the construction of the castles. Valuable products, fit for Kings, imported from the colonies, including spices and chocolate, were loaded at the port of Nantes and taken back up the Loire to grace the high tables of the castles.
The Loire Valley is in itself an inexhaustible source of flowers, fruits, vegetables, fish, vineyards and game, which is why it was a cherished playground for the sport (hunting) loving monarchy. Its strategic location, another on its already long list of attributes.