J. Stargaryen

They had come together at the ford of the Trident while the battle crashed around them, Robert with his warhammer and his great antlered helm, the Targaryen prince armored all in black. On his breastplate was the three-headed dragon of his House, wrought all in rubies that flashed like fire in the sunlight. - Rhaegar, the Targaryen prince armored all in black. 

He had lost both ears and a finger to frostbite, and he dressed all in black, the same as a brother of the Night’s Watch, except that his furs were ragged and greasy. - Gared, brother of the NW.

“The next time I see you, you’ll be all in black.” - Robb to Jon, who will be a brother of the NW.

Then he saw it, a shadow in the shadows, sliding toward the inner door that led to Mormont’s sleeping cell, a man-shape all in black, cloaked and hooded… but beneath the hood, its eyes shone with an icy blue radiance… - Dead Othor, a former brother of the NW.

Get it? Jon is a Targaryen prince "armored" all in black.

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