Was Cersei lying about her first born?

Either Cersei is lying to Cat in the 2nd episode about the “little black-haired beauty” who died in infancy, or Maggy was (wrong?) Cersei cops to all of her living children being Jaimie’s, but neither confirms nor denies any dead children between her and Robert.

Who really killed Robert Baratheon?

Varys bluntly tells Ned that his mercy is what killed King Robert, to Ned’s shame. Joffrey eventually has Ned executed, setting the stage for the War of the Five Kings. A singer named Marillion composes and performs a funny song about Robert and the boar, which implies that Cersei is Robert’s true killer.

Did Cersei really have a baby with Robert?

The TV series invented that Cersei actually had a son with Robert who died in the cradle (apparently to give her a sympathetic scene with Catelyn in the second episode); some viewers wondered if she made the story up to manipulate Catelyn, but later in Season 1 she speaks about the dead baby with Robert himself, which confirms she wasn’t lying.

Who was the first of Cersei’s children to die?

The first of Cersei’s children to die is the squealing blond psychopath known as Joffrey Baratheon. Remember him — that awful waste of pigs-breath who liked to torture Sansa and shoot arrows into unfortunate prostitutes?

Who is the only trueborn child of Cersei Lannister and Robert Baratheon?

They took him away and I never saw him again.” The unnamed trueborn son of Cersei Lannister and Robert Baratheon was the only trueborn child of both parents.

Why isn’t Cersei’s black-haired son included in her official count of children?

Writer Bryan Cogman was directly asked about this with regard to Maggy’s prophecy, and he indeed confirmed that Cersei’s black-haired son with Robert simply isn’t included in her “official” count of children because he died in the cradle: “Maggy’s just speaking of the three official kids who lived and were known, etc.