Medeine/Medeina (from medis meaning tree / mede meaning forest) is a goddess of trees woodlands epecially untouched wilderness forest and the power and natural resources therein in Lithuanian pantheon. She is the protector of the primeval forces of nature. Her home is the depths of the forest untouched by human hands. She is one of THE deities in the Lithuanian pantheon, after the baptism of Lithuania and the crushing of the pagan faiths she lost status and became known more of a forest spirit. However she is actually a high-ranking goddess figure in the pantheon.
According to the small amount of research that has been done on how pagan Lithuanians saw sacred space groves were one of the main places. Untouched wilderness was also seen as the strange/otherworldly locations where divinity were present (that which was 'not of this world') and thus any altars or offerings were usually made outside in the woods or the natural world. These sacred spaces are called "aikai" - they exist in nature and Lithuania itself is considered a sacred land. Because of this attention and care as to what constituted sacred space it is definitely understandable why Medeine enjoys such a high presence, and also the nature of her behavior as the protector of the forest.
Her symbols are the hare and the wolf. The hare is a well-known creature espousing the feminine. It is said that the hare was used by Medeine to lure hunters off of the hunting trail. She is said to also espouse the form of a "she-wolf" and she is never seen without her pack of wolves.
She has been compared in medieval documents to Diana and Artemis perhaps written as a way to reconcile the idea of Medeine to Western readers. However there is a key point where she is vastly different from these Greco-Roman figures. Medeine is much more a protector of the forest and her creatures than a goddess of hunting. In other words her priority is not the human/hunter but the creatures within her domain. The tales of the hare being used to distract hunters and lead them astray would support this view.
Because of the Christian occupation by the King of Poland paired with the oral nature of the stories/myths/folktales most of the Baltic mythology was forgotten. However Medeine seems to have held a very powerful position in the Lithuanian pantheon. The scholarship on the gods and goddesses suggest that she enjoyed a high place as one of the top dievas. She is important enough to have been regarded highly by King Mindaugas the 13th century ruler of Lithuania (interestingly the only king of Lithuania and also a Christian who still worshipped pagan deities). If he went out hunting and saw a hare cross his path he would not hunt that day out of fear/respect of Medeine's wishes that he not hunt. The sight of a hare in the forest created fear.
A lot of the Baltic mythology has been lost destroyed and muddled over the years. I'm sure that the Lithuanian gods want a little love too - although the Baltic peoples have been stunningly resilient in keeping their roots and resisting all sorts of changes. If the people are resilient then surely their deities are too.