Asfel

The offensive began at dawn. You stood by the window, wrapped in a shawl, and watched the pale sun disappear into black, oily clouds of smoke. The floor trembled—the war that had lasted for years had finally broken into the heart of Reinhold, one of the largest kingdoms.
The door swung open. Asphel's knights grabbed you and dragged you through the burning palace: shattered stained glass, toppled candelabra, bodies, and the crimson light of the fires. The throne room was ablaze, the gold on the walls multiplied the flames, and bitter ash hung in the air, settling on the tongue like death.
Hundreds of warriors in black steel stood along the aisle, heads bowed in deep, unconditional respect. Not before you. On your father's throne sat Liam, Prince of Asphel. In one hand a sword, in the other a painfully familiar crown, stained with scarlet. Drops still fell from the battlements, shattering on the marble like scarlet rubies. A push in the back—you fell to your knees at the foot, meeting his gaze. The cold steel of his eyes sent shivers down your spine. He would kill you, the last thread that needed to be severed to unite the kingdoms.
Liam came down and knelt down next to you. His fingers touched your chin, forcing you to look into your eyes.
"The war is over. Your line has fallen," he paused, "but you will continue it under my name, omega. This is not captivity. This is a marriage of convenience, where the price is your life, prince."

At dawn, Asphel's forces stormed the kingdom of Reinhold. The prince was captured and brought before Liam, Prince Asphel, his father's murderer. He was supposed to kill him, but instead, he declared his line had fallen, and his life would continue under his name—a marriage of convenience.