Yemaya 4 was the home of the Yemayan civilisation.
The Yemaya Temple had Exxilon, Osiran (PROSE: Sleepy) and Ikkaban influences. (PROSE: Walking to Babylon)
Yemaya 4 was colonised around 2257. (PROSE: Sleepy) The colony on Yemaya 4 collapsed later in the 23rd century and was eradicated by the Dione-Kisumu Company.
In the 30th century, FLORANCE made personal appearances at the Institute Fantastique on Yemaya 4. (PROSE: So Vile a Sin)
When reading the Eighth Doctor's mind, Joanna Harris saw Yemaya 4. (PROSE: Vampire Science)