Kingdom divided among sons

Rama ruled the kingdom for eleven thousand years. Slowly Kaushalya, Kaikeyi and Sumitra passed away.

One day the king of Kaikeya came to Rama and asked for his help. His land was being attacked the Gandharva Lomesha.
Rama called Bharata. He said Go to the land of your mother. Defeat the Gandharva and then make your sons the kings there.

Bharata went there and defeated the gandharvas. The sons of Bharata - Pushkara and Taksha were made kings there.

Sons of Lakshmana, Angada and Chadraketu were also made kings. The kingdom of Malya was given to Angada and Chandraketu got the land of Ahshwa.

Shatrughati and Subahu, sons of Shatrughna took over the kingdom of Mathura.

Ayodhya and Nandigrama was divided between Lava and Kusha. 

Sagara's sons burnt

One day Sagara decided to perform the Ashwamedha Yagna. He asked his sons to protect the horse of the sacrifice.  Sagara was afraid that Indra would try to steal the horse.
Sagara wanted to rule and become an emperor which is why he wanted to perform the sacrifice. Indra, in the heavens, thought Sagara wanted to take over his land too. He went to Brahma and wanted to know what to do. Brahma asked him to steal the horse. One time, in the middle of the night, when all the sons who were guarding the horse had fallen asleep, Indra stole the horse seeing this as a chance, and hid the horse in the nether world, in the ashrama of rishi Kapila.
The rishi was busy in his meditation, and never realized when Indra came and tied the horse there, and left.
When night was over, the brothers were shocked to see the horse missing. Having searched everywhere, they decided to search in the nether world. With spades, they started digging deep into the earth to go and below and explore the world there. They found the horse tied there, in the ashrama of Kapila.
Thinking Kapila had stolen the horse, they started abusing the sage, calling him a horse thief.

His meditation broken, the sage opened his eyes and saw the Sagara princes abusing him. Flames shot out of his eyes, and the sons of Sagara were instantly burnt to ashes.