1st century BC in architecture

First, 1st Battalion, 1st Marines, 1st Cavalry, 1st Reconnaissance Battalion, 1st Operations Group, 1st Regiment, 1st Mounted Division, 1st Senate district, 3rd Battalion, 1st Marines, 1st Fighter Brigade, 1st Division, Royal 1st Devon Yeomanry, 1st Armoured Infantry Brigade (United Kingdom), 1st Rifle Division, 1st Brigade Combat Team, 1st Cavalry Division (United States), 1st Pennsylvania Regiment, 1st Reconnaissance Squadron, 1st Word, 1st Squadron, 1st Cavalry Regiment, 2nd Battalion, 1st Marines, 1st Marine Expeditionary Brigade (United States), 1st Hussars, 1st Theater Sustainment Command, 1st Brigade, 1st Marine Regiment (United States), 1st Armored Division (United States), 1st Brigade Combat Team, 1st Infantry Division (United States), 1st Michigan Infantry Regiment, 1st Brigade Combat Team, 1951–52 Danish 1st Division, 1st & Ten, 1945–46 Danish 1st Division, 1st Distribution Support Battalion, 1st Artillery Regiment, 1946–47 Danish 1st Division, 1949–50 Danish 1st Division, 1948–49 Danish 1st Division, 1955–56 Danish 1st Division, 1st Kentucky Infantry Regiment, 1947–48 Danish 1st Division, 1st Kentucky Cavalry Regiment

1st Constitution Bancorp, 1st Marine Division, 1950–51 Danish 1st Division, 1st Engineer Regiment (Italy), 1st Missouri Infantry Regiment, 1st Airborne, 1952–53 Danish 1st Division, 1953–54 Danish 1st Division, 1954–55 Danish 1st Division, 1st Louisiana Infantry Regiment, 1st Bombardment Wing, 1st Air Defense Artillery Regiment, 1st Armoured Brigade (United Kingdom), 1st Louisiana Cavalry Regiment, 1st Battle Squadron, 1st Brigade (Australia), 1st Delaware Infantry Regiment, 1st (UK) Division, 1st Maryland Infantry Regiment, 1st Airborne Command Control Squadron, 1st (African) Division, 1st Division (Thailand), 1st Division (Australia), 1st Belorussian Front, 1st Combat Engineer Battalion, 1st ward, Chicago, 1st Horse (Skinner's Horse), 1st Colorado Infantry Regiment, 1st Parachute Division (Germany), 1st Maryland Cavalry Battalion, 1st Armored, 1st Expeditionary Rescue Group, 1st Infantry Regiment (United States), 1st Medical Brigade, 1st Infantry Division (United States), Ōita 1st district, 1st Royal New South Wales Lancers, 1st Canadian Parliament, 1st Georgia Infantry Regiment, 1st Armored Division (France), 1956–57 Danish 1st Division, 1st Light Car Patrol (Australia), 1st Anti-Aircraft Brigade, Francis Cook, 1st Viscount of Monserrate, 1st Cavalry Regiment (United States), 1st Fighter Squadron, 1st Source, 1st Infantry Division (France), 1st Cavalry Division (United States), 1st Brahmans

First, 1st Battalion, 1st Marines, 1st Cavalry, 1st Reconnaissance Battalion, 1st Operations Group, 1st Regiment, 1st Mounted Division, 1st Senate district, 3rd Battalion, 1st Marines, 1st Fighter Brigade, 1st Division, Royal 1st Devon Yeomanry, 1st Armoured Infantry Brigade (United Kingdom), 1st Rifle Division, 1st Brigade Combat Team, 1st Cavalry Division (United States), 1st Pennsylvania Regiment, 1st Reconnaissance Squadron, 1st Word, 1st Squadron, 1st Cavalry Regiment, 2nd Battalion, 1st Marines, 1st Marine Expeditionary Brigade (United States), 1st Hussars, 1st Theater Sustainment Command, 1st Brigade, 1st Marine Regiment (United States), 1st Armored Division (United States), 1st Brigade Combat Team, 1st Infantry Division (United States), 1st Michigan Infantry Regiment, 1st Brigade Combat Team, 1951–52 Danish 1st Division, 1st & Ten, 1945–46 Danish 1st Division, 1st Distribution Support Battalion, 1st Artillery Regiment, 1946–47 Danish 1st Division, 1949–50 Danish 1st Division, 1948–49 Danish 1st Division, 1955–56 Danish 1st Division, 1st Kentucky Infantry Regiment, 1947–48 Danish 1st Division, 1st Kentucky Cavalry Regiment, 1st Constitution Bancorp, 1st Marine Division, 1950–51 Danish 1st Division, 1st Engineer Regiment (Italy), 1st Missouri Infantry Regiment, 1st Airborne, 1952–53 Danish 1st Division, 1953–54 Danish 1st Division, 1954–55 Danish 1st Division, 1st Louisiana Infantry Regiment, 1st Bombardment Wing, 1st Air Defense Artillery Regiment, 1st Armoured Brigade (United Kingdom), 1st Louisiana Cavalry Regiment, 1st Battle Squadron, 1st Brigade (Australia), 1st Delaware Infantry Regiment, 1st (UK) Division, 1st Maryland Infantry Regiment, 1st Airborne Command Control Squadron, 1st (African) Division, 1st Division (Thailand), 1st Division (Australia), 1st Belorussian Front, 1st Combat Engineer Battalion, 1st ward, Chicago, 1st Horse (Skinner's Horse), 1st Colorado Infantry Regiment, 1st Parachute Division (Germany), 1st Maryland Cavalry Battalion, 1st Armored, 1st Expeditionary Rescue Group, 1st Infantry Regiment (United States), 1st Medical Brigade, 1st Infantry Division (United States), Ōita 1st district, 1st Royal New South Wales Lancers, 1st Canadian Parliament, 1st Georgia Infantry Regiment, 1st Armored Division (France), 1956–57 Danish 1st Division, 1st Light Car Patrol (Australia), 1st Anti-Aircraft Brigade, Francis Cook, 1st Viscount of Monserrate, 1st Cavalry Regiment (United States), 1st Fighter Squadron, 1st Source, 1st Infantry Division (France), 1st Cavalry Division (United States), 1st Brahmans, 1st Pontieri Regiment, 1st Test and Evaluation Squadron, 1st Fighter Wing, 1st Low Altitude Air Defense Battalion, 1st Civil Affairs Group, 1st Foreign Regiment (France), 1st Provisional Marine Brigade, 1st (Peshawar) Division, 1st Special Operations Squadron, 1st Maryland Cavalry Regiment, 1st Earl of Suffolk, 1st Battalion, 5th Marines, 1st Earl Temple, Joseph Maclay, 1st Baron Maclay, 2002–03 Danish 1st Division, 2003–04 Danish 1st Division, 1st Wisconsin Infantry Regiment, 1960 Danish 1st Division, 1st Airlanding Brigade (United Kingdom), 1st Air Cavalry Brigade, 1959 Danish 1st Division, 1st Mobile Corps, 1st Marine Logistics Group, Captain 1st rank, 1st millennium BC, Komandarm 1st rank, 1958 Danish 1st Division, 2001–02 Danish 1st Division, 1st Canadian Division, 1st Arkansas Cavalry Regiment, 1st Maryland Cavalry Battalion, Potomac Home Brigade, 1st Force Reconnaissance Company, 1st GAM: Amai Yuwaku, 1st Health Battalion (Australia), 1996–97 Danish 1st Division, 1st Ski Division (Wehrmacht), 1997–98 Danish 1st Division, 1995–96 Danish 1st Division, 1999–2000 Danish 1st Division, 1st Guards Brigade (Croatia), 2000–01 Danish 1st Division, 1st Aviation Regiment (United States), 1st Armoured Division (Australia), 1st Viscount Hampden, 1st Marine Aircraft Wing, 1st Minnesota Infantry Regiment, 1998–99 Danish 1st Division, 1st Strategic Aerospace Division, 1st Air Fleet, 1st Army Corps, 1st Florida Cavalry Regiment, 1st Armored Brigade (People's Republic of China), 1st Infantry Regiment (Lithuania), 1st Time, 1st Brigade (New Zealand), 1st Battalion, 227th Aviation Regiment (United States), 1st Commonwealth Division, 1st Panzergrenadier Brigade (Germany), 1st Australian Horse, 1st Airlift Squadron