To the Reach

In his youth, Aegon was known as the Summer Prince while his younger brother who was known as the Winter Prince due to their contrasting heritage, Aegon's mother hailing from sunny Dorne while Jaehaerys' from the snowy North. After he crowned flatterers and sycophants at the royal court had hailed him as the Summer King but Aegon knew better. Summer was almost over and the Stark's words were never more appropriate; Winter is coming.

The maesters have predicted that it will be the longest winter in a thousand years and Aegon knew that his kingdom would starve if it was true.

The Reach was the breadbasket of the Seven Kingdoms. In summer, its graneries overfilled with enough grain to feed the world and during winter it was the life blood of a hungry continent. Furthermore, Aegon had grandiose plans for the future and he needed the support of the lords of Westeros to implement his reforms. Some of the most influencial lords of Westeros lived in the Reach. From the marcher lords of House Tarly, the wealthy House Redwyne, the Rowans, the Florents and the overmighty House Hightower.

However none were as loyal as House Tyrell, who still remembered the debt that they owe to House Targaryen ever since Aegon the Conqueror raised them from mere stewards to the overlordship of the Reach. The Tyrells had fought for the Targaryens in every single war, only choosing neutrality during the Dance where dragons fought dragons. Yet, it was no secret that the current head of the House, the ambitious Mace Tyrell, wanted nothing more than to have a grandchild of his upon the Iron Throne, to secure the power of the Tyrells for generations to come.

The last time he was at Highgarden, he was a boy of three-and-ten and Mace had a young daughter who was pretty and would blush bright red whenever Aegon smiled at her. But things had changed since then. Apparently, Margaery Tyrell had grown into a woman whose beauty rivalled his own sister and he had nearly crippled Mace's heir, Willas, in a tourney at Sunspear.

It was high time that Aegon brought the Tyrells into the fold. Through matrimony.