Robert Pendas Denniston, a longtime resident of Mobile, Alabama, passed away peacefully on May 25, 2021, at the age of 100. Robert was born in La Paz, Bolivia on June 12, 1920. He was the son of Harold Siebert and Lillian (Pendas) Denniston. After growing up in Mobile, he attended the University of Alabama, receiving the LL.B. degree in 1941. In 1960, he married Juanita Sandlin. She was the love of his life, and he was devoted to her for fifty-four years until her death. Robert practiced law in Mobile for over seventy years. He was an active member of the Mobile and Alabama Bar Associations. He twice was awarded the Alabama State Bar Certificate of Merit for service to the Bar. He was a member of the Alabama Law Institute, and a Fellow of the Alabama Bar Foundation and the American Bar Foundation. He previously served as President of the Mobile Bar Association. In 1948, he reigned over the Mardi Gras celebration as King Felix III. He regularly attended the annual King's Luncheon preceding Mardi Gras, and enjoyed welcoming the new King Felix III and reminiscing about past Mardi Gras seasons with his friends. An active member of St. Paul's Episcopal Church, Robert served on the Vestry. He was a member of Delta Kappa Epsilon fraternity, the Knights of Revelry, and the Country Club of Mobile. Robert was a veteran of the U.S. Navy, serving in World War II and the Korean War, retiring as a Commander. Shortly after the birth of their son, Robert and Juanita purchased a property on Dog River, which was home for over fifty years. In his later years, Robert very much enjoyed taking care of the Dog River property and found peace and solitude in river life. His wife, Juanita, predeceased him. He is survived by his son, Michael Sandlin Denniston (Christine), and two grandsons, Robert Hughmark Denniston and William Churchill Denniston. The family thanks the dedicated caregivers who cared for Robert in his later years. A funeral service will be held at 10:00 a.m. on June 1, 2021, at St. Paul's Episcopal Church, with a reception to follow in the Parish Hall. The family will have a private interment at Mobile Memorial Gardens Cemetery, where Robert was a founding member of the Board of Trustees. Donations may be made to St. Paul's Episcopal Church.