The Prophet of Islam, Hazrat Muhammad (Peace Be Upon Him) is the most beloved and the most praiseworthy, in the entire universe. He is the Last Messenger of Allah Almighty and the beholder of the Holy Quran.
The Birth
The Holy Prophet (PBUH) was born to Hazrat Abdullah and Hazrat Amna, on the 12th of Rabi-ul-Awal, in 571 AD. His father, Hazrat Abdullah, died before he was born. So, he was raised by his grandfather Hazrat Abdul Muttalib who was the custodian of the Holy Kaaba, in the heart of Makkah. 
The Care
According to Arab tradition, the son of Hazrat Amna was given the caring custody of Hazrat Halima Sadia, the pious maid who fed the illustrious child and taught the Arab norms in a free and independent atmosphere.
The Custody
The ailing Hazrat Muttalib, his grandfather, called his son Abu Talib and handed him the custody of his grandson, asking him: “I am on the deathbed, and after me, you will leave no stone unturned in giving utmost attention to the son of late Abdullah.” Hazrat Abu Talib dedicated the rest of his life to his nephew who grew up as the wisest, the most truthful, and trustworthy young man. 
The Marriage
The tale of his honesty reached Khadija-tul-Kubra, the Arab lady of stature, who appointed Muhammad (PBUH) as the head of her trade entourage to Syria. This proved to be a very successful business tour that impressed the lady so much that she offered him to marry her. He accepted. She was 40, and he was 25, when both happily married. She gave birth to his most beloved daughter Hazrat Fatima-tu-Zahra (RA). They had four daughters and three sons. 
The Revelation
Hazrat Muhammad (PBUH), before being chosen as the Last Messenger of Allah Almighty, had been a frequent visitor to the ‘Cave of Hira’, where he used to meditate and think about the purpose of life, the sufferings of humanity, and its solutions. He was 40 years of age when in the Cave of Hira, the Arch Angel, Hazrat Jibrael came and passed on to him the First Revelation, saying: “Read, in the name of your Lord, who created: created man from a clot of congealed blood…” (Surah 96, Verse 1-2) This is how the chain of Revelations started and continued for the next 13 years, which formed the Holy Quran, the Book of Allah Almighty. The Last Revelation came on the occasion of the Prophet’s Last Sermon during Haj in Makkah. The Revelation said: “This day, I have perfected your religion for you, completed my favor upon you, and have chosen for you Islam as your religion.” (Chapter 5, Verse 3)
The Migration
In 622 AD, the Prophet (PBUH) and his followers migrated from Makkah to Madina. This heralded the Muslim era. The Prophet (PBUH) ordered the construction of a mosque called Masjid-e-Nabvi. He also entered into the Constitution of Madina with local clans including Jews. From here, the Muslims fought battles against the infidels, including the Battle of Badr, Battle of Uhud, and Battle of Trenches, under the direct command of the Prophet (PBUH). 
Islamic Calendar
Hazrat Umar (RA), the Second Caliph of Islam, started the Hijrah Calendar starting from the year of the Prophet’s migration from Makkah to Madina, for example from July 16, 622. Muslims use AH as a symbol for Hijrah. It has 12 months. The months start with the rising of the first moon and end with the sunset of the last moon. The months include Muharram, Safar, Rabi-ul-Awal, Rabi-us-Sani, Jamadi-ul-Awwal, Jamadi-us-Sani, Rajab, Shaban, Ramadan, Shawwal, Zul-Qada, Zul-Haj. 
The Establishment of Muslim State
The Prophet (PBUH) formally established a Muslim state and he dated his correspondence, treaties, and proclamations after other events of his life. He sent letters to the emperors of Persia and Rome and invited them to embrace Islam. 
The Passing Away of the Prophet (PBUH)
The Holy Prophet (PBUH) was 63 years old when in 632 he passed away after having a fever for some days. His last words were the prayer for the salvation of his Ummah, and “O God, the Noblest Companion!” He was buried in the Masjid-e-Nabvi. After his demise, Hazrat Abu Bakr Siddique (RA) became the First Caliph of Islam. The Prophet (PBUH) was a model of excellence. He had a flawless personality. His life presents a guide, motivation, and inspiration for all the ages of mankind.
The Prophet’s Love for Children
The Prophet (PBUH) loved children and was loved by children. He showed exemplary love and care to his grandsons Imam Hassan (RA) and Imam Hussain (RA). Upon seeing the children, he would stop by them and play with them. He used to pat them for showing appreciation and motivation. He had a strong habit of greeting the kids first. He played with both his grandsons and carried them everywhere with him. He perched both on his shoulders to take them to Masjid-e-Nabvi often. The children were always happy with him. Upon reaching Makkah for pilgrimage, the children of Banu Hashim came running to him and welcomed the Prophet (PBUH) at the entrance. 
Anas ibn Malik said: “The Prophet (PBUH) often visited us, I had a younger brother whose pet was a sparrow. He loved his bird so much. It died one day. When the Prophet (PBUH) came and found my brother sad about his little bird’s death, he sat beside him quietly, then talked to him lovingly: “O Umar what happened to your little bird?” Upon listening all the sad story of his little bird’s death, he consoled him by hugging him. Then the Prophet (PBUH) washed his tears and talked to my younger brother till he started smiling again.” 
And the incident of Shaheed’s son is unforgettable. It was Eid day. The Prophet (PBUH) came out from the mosque and saw some children playing. One of them was standing separately, weeping. He wasn’t wearing new clothes and new shoes. The Prophet (PBUH) approached him and asked why he was weeping on Eid day. The boy said that his fellow children were wearing new clothes and shoes, but “my father was martyred while fighting against infidels, and my mother isn’t able to buy me new clothes and shoes. So, seeing my rags, they are not letting me play with them.” 
Tears rolled down from the Prophet’s eyes. He said: “From now on, I am your father and I’ll take care of everything for you.” 
No one on the earth can be luckier than him whom the Prophet (PBUH) had called his son.