|Born||In 176 AC or 177 AC|
The Mystery Knight (mentioned)|
A Dance with Dragons (mentioned)
The World of Ice and Fire (mentioned)
Viserys' father, Lord Ossifer Plumm, was married to Princess Elaena Targaryen in 176 AC. Ossifer is said to have died during the bedding, however, yet Princess Elaena did conceive, and Viserys was eventually born.
Later, though, rumours were spread suggesting tha Lord Ossifer had died because he had seen his bride "in all her nakedness". Further rumours stated that it hadn't been Ossifer, but Prince Aegon Targaryen, later known as King Aegon IV, who had conceived Viserys on Elaena.