ADELPHI, Md. — Thelma Beall, co-founder of the Maryland-based restaurant institution Ledo Pizza and a defining figure in the region’s culinary history, died on New Year’s Eve at the age of 101. Her passing marks the end of an era for a brand that began as a small neighborhood restaurant and grew into one of the most recognizable names in Maryland-style pizza. Beall was born in 1924 in Upper Marlboro, Maryland, and spent her early years rooted in Prince George’s County. After