For 10 points, give this name held by the only English king from the House of Blois.
Under the 1606 Treaty of Vienna, a member of the Bocskay family with this first name became Prince of Transylvania. One king with this first name gained territory at the Treaty of Jam Zapolski, which he signed after defeating Ivan the Terrible. Besides the king who led Poland during the Livonian War, an English king with this name signed the Treaty of Winchester and succeeded Henry I. That king fought with Queen Maud during the Anarchy and was succeeded by Henry II Plantagenet. For 10 points, give this name held by the only English king from the House of Blois.
Under the 1606 Treaty of Vienna, a member of the Bocskay family with this first name became Prince of Transylvania.
{Steven} [accept: {Stephen}; {Stefan}; {Istvan}]