Ariel
.A spirit of the air and guardian of innocence. He was enslaved to the witch Sycʹorax, who overtasked him; and in punishment for not doing what was beyond his power, shut him up in a pine-rift for twelve years. On the death of Sycorax, Ariel became the slave of Calʹiban, who tortured him most cruelly. Prosʹpero liberated him from the pinerift, and the grateful fairy served him for sixteen years, when he was set free. (Shakespeare: Tempest.)
Aʹriel. The sylph that watched over Belinda. (Pope: Rape of the Lock, i.)
Aʹriel. One of the angels cast out of heaven. The word means lion of God. (Milton: Paradise Lost, book vi. 371.)