His father, a general, was Baron Carol Sjöblad Nilsson (1611–1696); his mother was Maria Eriksdotter Stierna (1614–1686).

The Action of 31 May 1677 ended with Sjöblad's loss of 1,500 men and his ship Amara Then, and he became a prisoner of war.

[2] In 1700, he took over the post of Governor of Gothenburg and Bohuslän, built as a port and depot for the Royal Navy.

After the magistrate had collected together evidence of his irregularities, including diversion of Crown resources and income, Sjöblad was summoned to the National Council of Stockholm.

He was brought to trial, accused of "several difficult goals af self-interest, abuse and self-readiness."