ard ▁the ▁important ▁crossing ▁over ▁the ▁river ▁Dan ube . ▁The ▁keep ▁was ▁built ▁during ▁the ▁reign ▁of ▁the ▁House ▁of ▁H ohen st auf en ▁and ▁explicitly ▁mentioned ▁in ▁a ▁document ▁from ▁ 1 3 8 4 . ▁The ▁Goth ic ▁sp ire ▁was ▁added ▁at ▁the ▁end ▁of ▁the ▁ 1 5 th ▁century . ▁The ▁original ▁mod est ▁Roman es que ▁castle ▁was ▁extended ▁in ▁the ▁ 1 6 th ▁century ▁into ▁a ▁r ena issance ▁palace . ▁In ▁ 1 5 2 5 ▁during ▁the ▁German ▁Pe as ants ' ▁War ▁the ▁castle ▁was ▁dam aged ▁by ▁revol ting ▁far mers ▁of ▁the ▁Bal tring er ▁H auf en . ▁ ▁Hans ▁von ▁Pa um g arten , ▁a ▁pat ric ian ▁from ▁A ugs burg , ▁was ▁en fe off ed ▁with ▁Er bach ▁Castle ▁in ▁ 1 5 3 4 . ▁His ▁he ir , ▁Hans ▁Georg ▁von ▁Pa um g arten , ▁started ▁works ▁to ▁re build ▁the ▁castle ▁on ▁a ▁large ▁scale ▁in ▁ 1 5 5 0 : ▁two ▁wings ▁alongside ▁each ▁other ▁on ▁top ▁of ▁large ▁v ault ed ▁bas ement ▁rooms , ▁three ▁store ys ▁high ▁with ▁four ▁more ▁levels ▁under ▁the ▁roof s . ▁The ▁works ▁were ▁completed ▁in ▁ 1 5 5 5 , ▁ru ining ▁Hans ▁Georg ▁von ▁Pa um g arten . ▁▁ ▁In ▁ 1 6 1 2 ▁Hans ▁Ludwig ▁of ▁Ul m ▁became ▁lord ▁of ▁Er bach . ▁During ▁the ▁Th irty ▁Years ' ▁War ▁Bernard