Short answers, pulled from the story.
Heart-burial is a type of burial in which the heart is interred apart from the body. This practice emerged in medieval Europe during the twelfth and thirteenth centuries when the physical body could not travel to its final resting place.
Sir James Douglas carried the heart of Robert the Bruce in a silver casket to Spain. Douglas died in battle against the Moors in Granada, and the heart was recovered and buried at Melrose Abbey.
Beginning in the thirteenth century, bishops of Würzburg had their hearts transported to Ebrach Abbey. Approximately thirty hearts found their final rest at Ebrach until the tradition ended in 1617.
Louis-Charles de France, known as Louis XVII, had his heart removed and placed in a crystal urn in the 1830s. The urn was finally reburied in 2004 at the St Denis Basilica.
Frédéric Chopin had his heart removed before his funeral in 1849 and preserved in alcohol to be returned to Poland. His sister smuggled the heart in an urn to Warsaw, where it was sealed within a pillar of the Holy Cross Church and removed for safekeeping during World War II.
The Herzgruft is a burial chamber in Vienna that protects 54 urns containing the hearts of members of the House of Habsburg.