CREATE TABLE table_26803 ("School" TEXT, "Mascot" TEXT, "Location" TEXT, "Founded" FLOAT, "Entered ISL" FLOAT, "Grades" TEXT, "Number of Students" TEXT, "Varsity Teams" FLOAT)

when was lawrence academy at groton established?
SELECT MIN("Founded") FROM table_26803 WHERE "School" = 'Lawrence Academy at Groton'
SELECT MIN("Founded") FROM "table_26803" WHERE "School" = 'Lawrence Academy at Groton'