Robert Erskine Memorial Plaque Rededication Ceremony. Ringwood Manor and the New Jersey Society of the Sons of the American Revolution cordially invited to attend a short rededication ceremony to formally recognize the reinstallation of the memorial plaque dedicated to the life and memory of Surveyor General Robert Erskine. Beginning at 11:00am and taking place at the historic cemetery at Ringwood Manor, speakers will note Robert Erskine's role in America's victory during the Revolutionary War. A memorial wreath will be placed at his grave site and the newly installed memorial plaque will be unveiled.