Herbert James Draper - Halcyone (1915) 

What is a Halcyon?

hal • cy • on   \ˈhal-sē-ən\

Noun 

1.       A bird identified with the kingfisher and held in ancient legend to nest at sea about the time of the winter solstice and to calm the waves during incubation. 

2.  Kingfisher

  Halcyon   is a genus of the tree kingfishers.

Halcyon  is a genus of the tree kingfishers.

Adjective

1.  Of or relating to the halcyon or its nesting period   

2.  Calm, peaceful   

3. Happy, golden   

4. Prosperous, affluent

Source: Merriam Webster http://www.merriam-webster.com/dictionary/halcyon