Snowflake

"I would save my horse, Coalblack, and the Witch's Snowflake (a noble beast and worthy of a better mistress) which are both stabled in the courtyard."

- Prince Rilian, after the death of the Witch

Snowflake was the name of the horse owned by the Lady of the Green Kirtle during her reign in Underland. She was a simple ordinary mare, unable to talk.

Role in the History of Narnia
The Lady of the Green Kirtle often rode Snowflake during her many outings to Overland with the enchanted Prince Rilian, which she made in order to accustom his eyes to the sunlight before their attack on Narnia. The Prince rode Coalblack, a black horse who was also owned by the Witch. Most of these outings likely occured near Ettinsmoor and Harfang.

After the disenchantment of Rilian, and the death of the Witch, Eustace and Puddleglum rode Snowflake to the nearest tunnel between Underland and Overland, while Rilian and Jill Pole rode Coalblack. The Sunless Sea was flooding quickly throughout Underland after the Witch's death, signaling the end of her magic, so it is unlikely that Rilian and his three rescuers would have escaped without the horses' aid.

Eventually, the roof of the tunnel became too low for them to pass through on horse-back, so the group had to dismount and lead the horses. When they reached the end of the tunnel, they were rescued by a group of Fauns and Dwarfs, who were in the middle of performing the Great Snow Dance.

Little else is known for certain about the two horses, but it is most likely that both remained happy and were well cared for in Narnia for the rest of their lives.

For a fuller explanation of Rilian's captivity and enchantment, see The Silver Chair.

Appearance
Snowflake was a pure white mare.