The mediastinum is the part of the thoracic cavity that contains the lung, the heart and its major blood vessels, the trachea, the thymus gland, and the esophagus. False lungs are located outside of the mediastinum.
Erlendr was a Nord warrior. He is a hero, and his ghost can be found inside the Hall of Valor in Sovngarde. He, along with Nikulas and Hunroor, was turned into a stone pillar at Brodir Grove by the wizard Grimkell while searching for Sovngarde. Ulfgar the Unending later avenged them by killing Grimkell.
Melisandre or Melisandre of Asshai is a shadowbinder from the distant country and city of Asshai, acting in the service of King Stannis Baratheon. She is also a priestess of the Lord of Light or Red God, R'hllor. She was sold into slavery as a child. Her name was once Melony.