The story of Christian the Lion was recorded in the book, Christian: The Lion at World’s End. Christian was a lion cub bought at Harrods, introduced to the wild in Africa and then reunited with his former owners some time later. They had been told he would not recognise them. But they went anyway…
If you want to get a lump in your throat, watch the video about it below:
This video is shorter but tells the story in text

