Vidgar

Vidgar was the dragon of Tarsya Adeyon, wife of Gaen Zyran, and thus through marriage, she associated herself to house Zyran since. It is said that Vidgar was put on the craddle of Tarsya about 4 months after her birth, and the egg seemingly hatched soon after, both becoming tied and bonded since a very early age.

The dragon's birth happened around 138 years before Aegon's conquest and 26 years before the fall of Valyria, probably being Vidgar one of the last dragons to be born there alongside Balerion. There is even a posibility that Vidgar could be related to Vhagar, Balerion and Meraxes, but this is just speculation. This means that Vidgar lived a total of 32 years. Her rider died of grief later at the age of 77, unable to overcome the death of her dragon.

Description
Vidgar is said to be a Green majestic female dragon. Vidgar was kind and its said to have been a fierced protective and good mother of her offspring. She had a humble heart as it is described in the records of House Zyran that have survived the doom. It grew spectacularly during its life and it could have reached the size of the Targaryen Dragons like Balerion or Vhagar in its later years, if she had lived enough.

Origins
Born from unknown origins, it is most likely the offspring of dragons from the Adeyon family which without being one of the original 40 houses had intermarried with them often, getting themselves to possess some dragons through marriages, most notably women. This is very similar to how Laenor and Laena Velaryon managed to become dragon riders without being in the Targaryen house making the Velaryons a house with dragons thanks to the marriage with a family that was.

Although Tarsya was born in the Adeyon household, known to not be dragonlords, her great-granmother, Maelya Belaerys, belonged to one of the most prominent houses of Valyria. This house was among the ten most prominent and dominant and thus was allowed to have an egg, even if many of the 40 houses had her doubts on it. Some even expected it to not hatch. Maelya's granfather had thus gifted her an egg from his own dragon, that was later laid on her craddle and hatched on a Dragon that will in turn produce its own clutch of eggs. This eggs were given to Maelya's sons and their dragons were inherited through her by their descendants (3 generations) till reaching Tarsya.

This meant that Vidgar was one of the few dragons of the house Adeyon. During the early years, Tarsya who had an adventurous nature is said to fly often to Lys in the west and over to the Dothraki sea in the north, travelling to the cold islands of the north and back in her youth. She was not interested in politics but due to her position as a noble woman and a dragonrider, she was a very desirable tool for marriage and empowerement of the Adeyon family.

Nest
Vidgar had three clutches of eggs, two of them were laid in Valyria. One gave birth to some dragons that were gifted to other members of the Adeyon family but they all died when Valyria was destroyed. Another clutch was laid in Valyria, which was presumably sinked as well before any of the eggs were able to be born or the offspring of it were fletchings. It is even little posibility that some of Daenerys eggs were laid by Vidgar in the distant past, but we will never know. The last clutch was laid in Lys during the stay of Gaen and Tarsya in the city but no offspring came from them until several centuries later, when they were able to be hatched by the mysterious forces that made Daenerys hatch hers.

With an unknown dragon from a prestigious family

 * Vindilax: A great female dragon named in honor of her mother, said to be golden. Her rider was the youngest sister of Tarsya - Killed in the doom of Valyria
 * Ceresis: A male dragon bonded to a member of the other prestigious house, placed in his craddle - Killed in the doom of Valyria

With Another Adeyon Dragon

 * Homyros: Given to Tarysa's niece in the craddle - Killed in the doom of Valyria
 * Lunithor: Given to Tarysa's Cousin in the craddle - Killed in the doom of Valyria
 * Argul: Given to another niece in the craddle - Killed in the doom of Valyria

With Hebrilax

 * Zuryax
 * Verex
 * Shigar
 * Kelarion
 * Norsis