Philip V (Greek: Φίλιππος Ε΄) (238 BC – 179 BC) was King of Macedon from 221 BC to 179 BC. Philip's reign was principally marked by an unsuccessful struggle with the emerging power of Rome. Philip was attractive and charismatic as a young man. A dashing and courageous warrior, he was inevitably compared to Alexander the Great and was nicknamed the darling of all Greece (Greek: ἐρώμενος ἐγένετο τῶν Ἑλλήνων).

The son of Demetrius II and Chryseis, Philip was nine years old at his father's death in 229 BC. He had an elder paternal half sister called Apame. His cousin, Antigonus Doson, administered the kingdom as regent until his death in 221 BC when Philip was seventeen years old.

On his ascent to the throne, Philip quickly showed that while he was young, this did not mean that Macedon was weak. In the first year of his rule, he pushed back the Dardani and other tribes in the north of the country.

In the Social War (220 BC-217 BC), the Hellenic League of Greek states was assembled at Philip V’s instigation in Corinth. He then led the Hellenic League in battles against Aetolia, Sparta and Elis. At the same time he was able to stamp on his own authority amongst his own ministers. His leadership during the Social War made him well-known and respected both within his own kingdom and abroad.

Philip II of Macedon (Greek: Φίλιππος Β' ὁ Μακεδών – φίλος phílos, "friend" + ἵππος híppos, "horse" — transliterated  Philippos (help·info); 382–336 BC), was a Greek king (basileus) of Macedon from 359 BC until his assassination in 336 BC. He was the father of Alexander the Great and Philip III.

Philip was the youngest son of the king Amyntas III and Eurydice I. In his youth, (c. 368–365 BC) Philip was held as a hostage in Thebes, which was the leading city of Greece during the Theban hegemony. While a captive there, Philip received a military and diplomatic education from Epaminondas, became eromenos of Pelopidas, and lived with Pammenes, who was an enthusiastic advocate of the Sacred Band of Thebes.

In 364 BC, Philip returned to Macedon. The deaths of Philip's elder brothers, King Alexander II and Perdiccas III, allowed him to take the throne in 359 BC. Originally appointed regent for his infant nephew Amyntas IV, who was the son of Perdiccas III, Philip managed to take the kingdom for himself that same year.

Barack Hussein Obama II (ⁱ/bəˈrɑːk huːˈseɪn oʊˈbɑːmə/; born August 4, 1961) is the 44th and current President of the United States. He is the first African American to hold the office. In January 2005, Obama was sworn in as a U.S. Senator in the state of Illinois. He would hold this office until November 2008, when he resigned following his victory in the 2008 presidential election.

Born in Honolulu, Hawaii, Obama is a graduate of Columbia University and Harvard Law School, where he was the president of the Harvard Law Review. He was a community organizer in Chicago before earning his law degree. He worked as a civil rights attorney in Chicago and taught constitutional law at the University of Chicago Law School from 1992 to 2004. He served three terms representing the 13th District in the Illinois Senate from 1997 to 2004.

Following an unsuccessful bid against the Democratic incumbent for a seat in the United States House of Representatives in 2000, Obama ran for the United States Senate in 2004. Several events brought him to national attention during the campaign, including his victory in the March 2004 Illinois Democratic primary for the Senate election and his keynote address at the Democratic National Convention in July 2004. He won election to the U.S. Senate in Illinois in November 2004. His presidential campaign began in February 2007, and after a close campaign in the 2008 Democratic Party presidential primaries against Hillary Rodham Clinton, he won his party's nomination. In the 2008 presidential election, he defeated Republican nominee John McCain, and was inaugurated as president on January 20, 2009. Nine months later, Obama was named the 2009 Nobel Peace Prize laureate. In April 2011, he announced that he would be running for re-election in 2012.