Diederik Tuyll van Serooskerken

Diederik Jacob van Tuyll van Serooskerken (; 6 April 1772 – 11 April 1826) was a Dutch nobleman who served as a major general in the Imperial Russian Army, and later as the fourth Russian ambassador to the United States.
Biography.
Tuyll van Serooskerken was born on 6 April 1772, in The Hague. He served in the Dutch army until November 1803. He later joined the Imperial Russian Army and fought in the Napoleonic Wars as a major general.
After the war, he served various diplomatic positions for Russia in the Kingdom of Naples and Holy See. On 19 April 1823, he was appointed by Czar Alexander I of Russia to be the Russian ambassador to the United States. He served until 1826, and died on 11 April that same year during a sea voyage from his Washington posting.
He was buried in Halifax, Nova Scotia, in St. Peter's Cemetery, in April 1826. His grave is unmarked and lies under a parking lot built on top of the cemetery.