Uprising in Meereen

"It was only a matter of time, your grace. Conquerors always meet with resistance."

- Barristan Selmy to Daenerys Targaryen.

The Uprising in Meereen is an ongoing conflict in Meereen between Queen Daenerys Targaryen and the Sons of the Harpy, former Masters who want to overthrow her rule for abolishing slavery.

First attacks
The Unsullied pull down the golden harpy atop the Great Pyramid of Meereen. Having completed the task, a soldier named White Rat heads to a brothel where he pays a woman to simply hold him. As he relaxes, an assassin wearing a harpy mask sneaks in and slits his throat. When she learns of White Rat's death, Queen Daenerys commands he receive a public burial and that his murderers be held accountable.

The Uprising
After the Riot of Meereen, Hizdahr zo Loraq is once again persuading Daenerys to open the fighting pits. Seeing that Dany is becoming more vulnerable, The Sons of the Harpy stage attacks all across Meereen. A group of Unsullied, led by Grey Worm, respond but are trapped and ambushed in a passageway. Ser Barristan sees the panicked masses evacuating the area and runs into the fighting. He kills several men but ultimately falls. Grey Worm, injured and bleeding, falls on the ground beside him. Although Grey Worm survives, he is severely injured and in bed rest being taken care by Missandei, while Barristan's death leaves Daenerys both devastated and furious.

In the books
In the A Song of Ice and Fire novels, the armed resistance of the Sons of the Harpy is referred to as "the shadow war" because the attacks of the Sons are mostly carried out at night. At first, they have limited their attacks to unarmed freedmen. As they have grown bold, they moved to kill Daenerys's soldiers, among them Stalwart Shield and Mossador.

Daenerys suspects that the noble houses of Meereen are the ones who send the Sons of the Harpy to terrorize her loyalists and weaken her reign, but there is no evidence against them. Daenerys takes several steps to fight back: Unfortunately, none of the above stops the murderers, or even slows them down. Daenerys makes an offer to Hizdahr: if he manages to stop the murders for ninety days, she will marry him.
 * She forms an army of watchmen called "The Brazen Beasts" wear brass masks in the shape of different animals to protect the member's identity from attacks by the Sons of the Harpy.
 * She takes a child hostage from each of the Meereenese noble familes.
 * She collects a "blood tax" - a hundred pieces of gold from every noble house for each freedman that the Harpy’s Sons have slain.
 * She offers a generous reward to whoever provides information about the Sons of the Harpy - one hundred honors, later increases it to one thousand honors.
 * The Brazen Beasts have taken dozens of the Harpy’s Sons, and those who have survived their capture have yielded names when questioned sharply, but the identity of their leader (known as "the Harpy") remains unknown.