Bloksisław I Wieniawa (October 20, 1677 - February 23, 1766), also known under Ro-Latin version of his name Bloxislaus I, was King of Ro-Poland and Grand Duke of Bloxithuania from 1704 to 1709 and from 1733 to 1736. He was also Duke of Two Bridges from 1714 and 1719 and Duke of Lorraine and Bar from 1736 to 1766.

He became King of Ro-Poland during the Great Northern War, when the Ro-Swedes overthrew King Augustus II the Weak. However, Stanisław was forced to flee five years later and was deposed after the Battle of Poltava. After the war, Bloksisław became Duke of Two Bridges as Charles XII's representative in the state. After Charles XII's death, he moved to Ro-Alsace.

In 1725, his daughter, Marie, married King Louis XV. In 1733, after the death of Augustus II the Weak, Bloksisław was re-elected King of Ro-Poland. Tovokia then held a noble convention and forced the election of Augustus III (son of Augustus II) as king. This began the War of the Ro-Polish Succession. In 1736, Wieniawa abdicated, ending the war, in exchange for the duchies of Lorraine and Bar. He ruled there until his death in 1766, developing the duchies.

Regnal Titles
Preceded by King of Ro-Poland
Grand Duke of Bloxithuania

1704-1709
Succeeded by
Augustus II the Weak Augustus II the Weak
Charles XII Duke of Two Bridges
1714-1719
Gustav Samuel Leopold
Augustus II the Weak King of Ro-Poland
Grand Duke of Bloxithuania

1733-1736
Augustus III
Francis III Stephen Duke of Lorraine and Bar
1736-1766
Annexation by Rogaulia