Background: Point of Grace is an all-female Contemporary Christian music vocal group. The trio consists of Shelley Breen, Denise Jones, and Leigh Cappillino. The group started out as a quartet in 1991, with original members Breen and Jones, as well as Terry Jones and Heather Payne. In November 2003, Terry Jones decided to spend more time with her family after giving birth to her third child, and left the group, with Cappillino joining in March 2004 for their 2004 release
Context: In July 1995, the girls signed a major book deal with Simon & Schuster. They had been featured in major publications such as the Ladies Home Journal and TIME Magazine. The book was written by the girls along with Davin Seay. In it, each member told her life story, and the other chapters were divided into question-and-answer sections were the girls addressed topics like dating, sex, clothes, family life, and friends.  Along with the book, the girls also began work on their third album. This project was a growing pain of sorts for them. John Mays, the man who had signed them to Word Records, had left his position there as A&R to join Sparrow Records. The girls were left to make all major decisions, and for the first time, were executive producers of their album. They took their time with the record, and the result was Life Love & Other Mysteries, released on September 9, 1996. The book was also released that same day, subtitled "Advice and Inspiration from Christian Music's No. 1 Pop Group."  On the day of the album release, Word Records chartered the Dallas Mavericks' DC-9 jet and the girls flew to five different cities in one day to promote their album. During each stop they performed their current single, "Keep The Candle Burning", which went No. 1 on the day their album released. It became the girls' twelfth consecutive No. 1 single. A music video with footage from their whirlwind promo tour was released a few months later. The girls announced that they would be co-headlining an arena tour with 4Him, who had just released their album The Message. The tour hit major markets and was very successful, leading both groups to add a spring leg, which went into early summer of 1997. In 1996, the girls contributed the song "Follow the Star" to the album Emmanuel: A Musical Celebration of the Life of Christ. They were not able to go on the tour, with Avalon taking their place.  Life Love & Other Mysteries has been one of their most successful albums to date. It was certified gold by the RIAA in 1997 and platinum in 1999. The album debuted at No. 1 and stayed at the top of the charts for 10 weeks. It was one of the Top 5 selling albums throughout 1997 and one of the Top 10 selling albums in 1998. The album was nominated for a Grammy for Best Pop/Contemporary Gospel Album in 1997. The girls were also nominated for the 1997 Group of the Year at the Dove Awards and "Keep The Candle Burning" was nominated for Song of the Year. The girls gave a memorable performance of the song during the live The Nashville Network broadcast from the Sommet Center, with the whole audience swaying little flashlights back and forth. The girls continued touring until September of that year and took some time off when Denise's first child arrived in October.
Question: Any other popular singles?
Answer: they performed their current single, "Keep The Candle Burning", which went No. 1 on the day their album released.

Problem: Background: Prince Grigory Aleksandrovich Potemkin-Tavricheski (Russian: Grigorii Aleksandrovich Potiomkin-Tavricheskii; 'Potyomkin', r Grigoriy Aleksandrovich Potyomkin-Tavricheskiy; October 11 [O.S. September 30] 1739 - October 16 [O.S. October 5] 1791) was a Russian military leader, statesman, nobleman and favourite of Catherine the Great. He died during negotiations over the Treaty of Jassy, which ended a war with the Ottoman Empire that he had overseen. Potemkin was born into a family of middle-income noble landowners.
Context: Potemkin then embarked on a period of city-founding. Construction started at his first effort, Kherson, in 1778, as a base for a new Black Sea Fleet he intended to build. Potemkin approved every plan himself, but construction was slow, and the city proved costly and vulnerable to plague. Next was the port of Akhtiar, annexed with the Crimea, which became Sevastopol. Then he built Simferopol as the Crimean capital. His biggest failure, however, was his effort to build the city of Ekaterinoslav (lit. The glory of Catherine), now Dnipropetrovsk. The second most successful city of Potemkin's rule was Nikolayev (now better known as Mykolaiv), which he founded in 1789. Potemkin also initiated the redesign of Odessa after its capture from the Turks; it was to turn out to be the greatest.  Potemkin's Black Sea Fleet was a massive undertaking for its time. By 1787, the British ambassador reported twenty-seven battleships. It put Russia on a naval footing with Spain, though far behind the British Navy. The period represented the peak of Russia's naval power relative to other European states. Potemkin also rewarded hundreds of thousands of settlers who moved into his territories. It is estimated that by 1782 the populations of Novorossiya and Azov had doubled during a period of "exceptionally rapid" development. Immigrants included Russians, foreigners, British convicts diverted from Australia, Cossacks and controversially Jews. Though the immigrants were not always happy in their new surroundings, on at least one occasion Potemkin intervened directly to ensure families received the cattle to which they were entitled. Outside of Novorossiya he drew up the defensive Azov-Mozdok line, constructing forts at Georgievsk, Stavropol and elsewhere and ensured that the whole of the line was settled.  In 1784 Lanskoy died and Potemkin was needed at court to console the grieving Catherine. After Alexander Yermolov was installed as the new favorite in 1785, Catherine, Yermolov and Potemkin cruised the upper Volga. When Yermolov attempted to unseat Potemkin (and attracted support from Potemkin's critics), he found himself replaced by Count Alexander Dmitriev-Mamonov in the summer of 1786. Potemkin returned to the south, having arranged that Catherine would visit in the summer of 1787. She reached Kiev in late January, to travel down the Dnieper after the ice had melted (see Crimean journey of Catherine the Great). Potemkin had other lovers at this time, including a 'Countess' Sevres and a Naryshkina. Leaving in April, the royal party arrived in Kherson a month later. On visiting Sevastopol, Austria's Joseph II, who was traveling with them, was moved to note that "The Empress is totally ecstatic... Prince Potemkin is at the moment all-powerful".
Question: what was the plague?
Answer: