 On 1 May <unk> , an expedition of <unk> @-@ Norman knights with an army of about six hundred landed at <unk> Strand in present @-@ day County Wexford . It was led by Richard de Clare , called <unk> due to his prowess as an archer . The invasion , which coincided with a period of renewed Norman expansion , was at the invitation of <unk> Mac <unk> , the king of Leinster . 
