The Tension in the Realm
The tension in the Realm has its base in the reforms of King Dearon II, which to his detractors are seen as megalomaniacal going-on-tyrannical. The reason for this ire is that many smaller Lords are losing their income (through such acts as the revocation of tolls) as well as the loss of legal power, with Lords Paramount & the King being given greater power to arbitrate disputes. In doing so, and in seeking to cement the peace with Dorne, The King has Made the realm a peaceful one- with little prospects for Knights to expand the demesne, extract ransoms, or otherwise win glory and gold. However, the anger of the Knightly class is being articulated as being in opposition to the Kings vain, foreign and un-masculine ways: with his spending on a beautified palace at Summerhall; his court of Maesters, Alchemists, Dornish poets, artists and eccentrics from across the Narrow Sea, and his shunning of martial pursuits.
The Lords Paramount are backing the king, enjoying as they are the rewards of more centralised rule; acting as the executors of the new Crown Laws and with coffers swelling from the boom in trade.
The North is largely disinterested as the Northern customs of hospitality prohibit the formal levying of tolls (though ‘gifts’ are not uncommon), and given the geography of the North, its Lords are left to tend to their own business with little oversight from Winterfell and none whatsoever from Kings Landing.