Robert Lightwood is a character from the popular book series, The Mortal Instruments, written by Cassandra Clare. He is the father of Alec and Isabelle Lightwood, who are both Shadowhunters, a group of humans dedicated to protecting the world from demons and other supernatural threats. Robert is known for his strong sense of duty and commitment to the Shadowhunter way of life. In the series, Robert serves as a high-ranking member of the Clave, the governing body of the Shadowhunters. His character often grapples with the challenges of balancing family loyalty and the responsibilities of his position. Throughout the story, he plays a significant role in the dynamics of the Lightwood family and their interactions with other characters.