Eloise

Eloise was the sister of Queen Adriana Rys. She never appears in the Crown and the Flame series, and is only ever mentioned by Adriana and Luther Nevrakis in Book 1, Chapter 1.

Origins
One can assume that Eloise grew up alongside her sister Adriana. They presumably remained close even after Adriana married into Stormholt's royal family and later became Queen.

Personality
In the loosest of terms, one might call Eloise "promiscuous". This is shown when Adriana mentions that she enjoys going away for long periods with her lovers, and when Luther reveals her "latest lover" was a Nevrakis spy.

Adriana also says that Eloise was fashionable during a conversation with her daughter, Kenna.

Current status
Whether Eloise is still alive or not is up for debate. It's mentioned by Luther that she had her eyes gauged out while being interrogated for details about Stormholt Castle's secret passage. This would imply that she most likely died from her interrogation.

Adriana Rys
Adriana was Eloise's sister. Not much is said about their relationship.

Kenna Rys
Kenna was Eloise's niece. Not much is said about their relationship.

Lovers
As is mentioned, Eloise had a string of lovers, which Adriana attributed to "the joys of not being Queen".